Grades do not travel cleanly across education systems. A Grade 9 in GCSE, a 7 in an IB subject, an A in Singapore A-Level, a 5 on an AP exam and a G3 subject result under Singapore’s SEC are not points on one universal ruler. They are outcomes produced by different qualifications, subject structures, assessment objectives, cohorts, grading models and purposes.

This guide is for students, parents, schools and international families comparing qualifications, grade equivalence, GCSE vs IGCSE vs SEC, IB vs A-Level, AP credit, international qualification recognition, university entry and transfer between school systems. Its central rule is deliberately conservative: the receiving institution decides what it recognises and how it uses the qualification.

The purpose of comparison is therefore not to manufacture a universal conversion table. It is to answer a narrower, more useful question: what does this receiving school, university, employer, licensing body or scholarship actually accept for this purpose?

The quick answer: recognition, equivalence and admission are different

Term	Question it answers	Who decides?
Recognition	Will this institution accept the qualification as valid evidence?	Receiving institution / authority
Comparability	At what broad level may this qualification be comparable in another framework?	Relevant credential-evaluation or recognition body
Admission eligibility	Can I apply to this programme with this qualification?	University / school / programme
Subject prerequisite	Does my subject preparation meet the programme requirement?	Receiving programme
Credit / advanced standing	Will prior study reduce the amount I must complete?	Receiving institution
Professional recognition	Does this credential meet licensing or professional requirements?	Regulator / professional body
Grade conversion	How will my result be interpreted in this specific selection process?	Receiving institution

These decisions can produce different answers for the same qualification. A university may recognise an IB Diploma for admission but give no course credit. Another may award credit for selected Higher Level subjects. A professional programme may impose additional prerequisites even when general admission is possible.

1. A qualification is more than its grade scale

To compare qualifications, begin with the qualification object itself: awarding authority, educational stage, subject level, curriculum, assessment format and intended use.

Two systems can both use letters A–E and still mean different things because the underlying curriculum and assessment are different. Two systems can use completely different scales and still prepare students for a similar educational transition.

2. Never compare a subject grade with a whole diploma without saying so

An IB subject grade from 1–7 is not the same object as the total IB Diploma score out of 45. An AP exam score is a result in one AP subject, not a secondary-school graduation credential by itself. An SAT score is an admissions test result, not a school-leaving qualification.

Before conversion, classify the object.

3. Qualification type matters

• National school-leaving qualification
• International school-leaving qualification
• Subject-level examination
• Diploma programme
• Standardised admissions test
• Advanced course examination
• Vocational or technical credential
• Professional or licensing qualification

Comparison should remain inside the correct category unless the receiving institution explicitly bridges categories.

4. Singapore’s SEC makes subject level explicit

From the 2027 graduating cohort, students in Singapore sit the Singapore-Cambridge Secondary Education Certificate. The certificate records subjects together with the subject level offered: G1, G2 or G3.

This means a future reader should not treat “SEC Mathematics” as one undifferentiated qualification. The subject level is part of the result’s meaning.

5. G1, G2 and G3 are not percentile labels

Subject levels describe different curriculum and assessment levels. They should not be interpreted as a direct statement about a student’s overall ability or as a universal conversion into another country’s grade.

The receiving institution determines how a particular SEC subject level meets its own entry requirements.

6. Singapore O-Level and SEC have a transition boundary

Singapore’s GCE O-Level remains relevant to cohorts graduating before the SEC transition. The Singapore-Cambridge O-Level is also historically distinct from the UK GCSE and from Cambridge International IGCSE, despite overlapping subject names and Cambridge participation in examining arrangements.

Do not write “O-Level = GCSE” without specifying which O-Level, which GCSE, which subject and which receiving institution.

7. GCSE 9–1 is a UK grading system, not a world conversion table

GCSE grades 9–1 describe performance within GCSE assessment in England. The scale is meaningful inside that qualification system. A receiving institution elsewhere may use its own guidance when comparing an international result to GCSE entry expectations.

Use GCSE 9–1 Grades Explained for the internal meaning of the scale.

8. IGCSE is not one universal awarding body

International General Certificate of Secondary Education programmes are offered by different awarding organisations. Cambridge IGCSE is one major route; Pearson Edexcel International GCSE is another.

When an institution asks for “IGCSE”, check whether it accepts all recognised awarding bodies or specifies subjects, grades or boards.

9. Cambridge IGCSE and Singapore secondary qualifications serve different systems

Cambridge IGCSE is an international qualification used across many school systems. Singapore’s SEC is the national secondary credential for the relevant Singapore cohort. They can both support progression, but their curricula, grading, subject-level architecture and institutional context differ.

See Cambridge IGCSE and Singapore Secondary Qualifications for the fuller crosswalk.

10. IB Diploma recognition is receiving-institution specific

The IB Diploma is a coherent programme with six subject groups, Higher and Standard Level subjects and the core. Universities around the world recognise it, but admission thresholds, subject prerequisites and credit policies are institution-specific.

A 38-point offer at one university does not become a universal definition of what 38 “equals”.

11. IB subject grades and total points do different jobs

A programme may require a total score plus specified Higher Level grades. Another may focus heavily on prerequisite subjects. A strong total cannot always compensate for a missing required subject.

Always read programme prerequisites, not only headline point offers.

12. Singapore A-Level uses H1, H2 and H3 subject depth

Singapore-Cambridge A-Level subjects are offered at different levels, and university admissions consider the applicable qualification and programme rules. An H2 subject result should not be reduced to a foreign letter-grade conversion without reference to what the receiving institution requires.

13. UK and international A-Levels require qualification-specific reading

A-Level is a family name used across several awarding systems. NUS, for example, publishes a specific admissions page for international A-Levels and identifies accepted boards and programme eligibility conditions.

The lesson is important: “A-Level” is not enough information for an admissions decision.

14. AP is a course-and-exam system, not a complete high-school diploma

AP scores run from 1 to 5 on individual exams. Universities decide whether an AP score contributes to admission, placement or credit. A 5 may earn credit at one institution, placement at another and no advanced standing at a third.

See AP Courses, Scores and College Credit.

15. SAT and ACT are admissions tests, not school qualifications

SAT and ACT scores may form part of a university application, but they do not replace the applicant’s school-leaving qualification unless an institution explicitly says how they are used.

A student should not ask “What GCSE grade equals 1400 SAT?” because the tests measure different things for different purposes.

16. Recognition is purpose-specific

A qualification can be recognised for general university entry but not for a particular professional programme. It can be recognised for admission but not for transfer credit. It can be accepted by one university but not another.

Always add the purpose to the question.

17. “Accepted” does not mean “competitive”

Many admissions pages publish a minimum level that allows an application to be considered. Actual competitive outcomes can be stronger, especially for selective programmes.

Do not translate “minimum to apply” into “score that gets admitted”.

18. NUS uses qualification-specific admission routes

NUS publishes separate international-qualification pages and programme prerequisites. For Singapore Citizens and Permanent Residents with international qualifications, its general admissions requirements include completion of at least 12 years of general education, together with programme prerequisites and applicable Mother Tongue requirements.

Individual qualification pages then specify what results are needed to apply and whether particular programmes are available.

19. NTU also uses qualification-specific routes

NTU publishes a list of accepted international qualifications, application windows and result-availability requirements. It also requires programme-specific subject prerequisites.

This is direct evidence that qualification recognition is an institutional process, not a universal grade-conversion exercise.

20. Timing can affect recognition in practice

A qualification may be acceptable but its results may arrive too late for a particular intake. NTU, for example, publishes deadlines for when final results must be available and notes earlier requirements for some programmes.

Recognition without timing is incomplete planning.

21. Programme prerequisites override broad comparability

A broad credential comparison might say that two qualifications are both upper-secondary or pre-university awards. That does not tell an Engineering faculty whether the applicant studied enough Mathematics or Physics.

Subject prerequisites sit below the qualification-level comparison and can decide the application.

22. Medicine, Dentistry and Law often add stricter rules

Highly selective or professionally regulated programmes may restrict which qualification states are eligible, require final results by earlier dates, demand specific subjects or add selection tests and interviews.

A general university recognition page should not be used as the final authority for these programmes.

23. Professional recognition is a separate layer

A degree can be academically recognised while professional practice still requires approval from a regulator or professional body. Medicine, law, architecture, engineering, psychology and teaching can have jurisdiction-specific professional requirements.

Do not ask only whether the university is recognised. Ask whether the degree supports the intended professional route in the place where the graduate intends to practise.

24. Qualification frameworks are useful, but broad

National or regional qualification frameworks can describe levels of learning and typical complexity. They are useful for broad comparability. They do not automatically create one-to-one grade conversions or admission entitlements.

Level is not score.

25. Credential-evaluation services can provide comparability, not admission guarantees

In some countries, recognised credential-evaluation services issue statements comparing foreign qualifications with national frameworks. These can help employers or institutions interpret a credential.

The receiving institution still decides how it uses that information.

26. Grade distributions differ across systems

Even where two qualifications sit at a similar educational stage, the proportion of candidates receiving top grades can differ because curricula, cohort composition, assessment design and standard-setting differ.

A percentile-based conversion can therefore become misleading if it ignores what each exam is designed to measure.

27. Criterion and norm references are different ideas

Some interpretations focus on whether candidates meet defined standards; others use cohort performance in standard-setting or selection. Most real examination systems combine technical processes that are more nuanced than the simple classroom distinction.

Do not assume that the same percentage correct has the same grade meaning across boards.

28. Raw marks and final grades are not interchangeable

An exam board may set grade boundaries after considering the paper and standard-setting process. A raw score of 70% can correspond to different grades across subjects or sessions.

Therefore, “70% in system A = grade X in system B” is rarely safe without an official conversion rule.

29. Subject names can hide different curricula

“Mathematics”, “Biology”, “English” and “Economics” appear across many systems. The familiar title can make the subjects look equivalent.

Compare syllabus content, assessment objectives and level. A receiving programme may care about whether specific topics were studied, not only whether the transcript says Mathematics.

30. Assessment objectives reveal what the grade represents

Two examinations can cover similar content but weight recall, application, analysis, practical work, coursework or extended writing differently.

The next Future Build route, Assessment Objectives Across Examination Boards, exists because grade comparison without construct comparison can be misleading.

31. Coursework changes the evidence base

A qualification with substantial coursework samples student performance over time. A qualification dominated by terminal examinations samples performance under controlled exam conditions. Neither structure is universally superior.

The grade reflects the assessment system that produced it.

32. Practical work changes the evidence base

Science, Art, Music and Computing qualifications may include practical, portfolio or performance components. Two students with the same headline subject grade may have been assessed through different mixes of practical and written evidence.

33. Language of instruction matters

An institution may require separate English-language evidence depending on the applicant’s qualification and schooling history. A qualification can be academically acceptable while an English requirement remains outstanding.

NUS and NTU publish qualification-specific English or standardised-test requirements rather than applying one universal rule to every applicant.

34. Mother Tongue requirements can be an additional Singapore layer

Singapore Citizens and Permanent Residents applying to local universities may need to satisfy MOE Mother Tongue requirements depending on their route. This sits alongside academic qualification recognition.

An international qualification does not erase local policy requirements automatically.

35. School transfer and university admission need different crosswalks

A child moving from one secondary school system to another needs placement into an appropriate year and subject level. A university applicant needs qualification recognition and programme eligibility.

Do not use a university admissions table to decide a twelve-year-old’s school year placement.

36. Age, years of schooling and qualification stage all matter in school transfer

When moving between school systems, institutions may consider age, completed years, curriculum coverage, language, transcript results and placement tests.

There may be no exact “Grade 8 = Secondary 2” rule that works in every school because school entry calendars and cut-off ages differ.

37. Grade-point averages are institution-specific summaries

GPA can mean weighted or unweighted averages, different scales and different course difficulty policies. A 4.0 is not self-explanatory without knowing the school’s scale and transcript context.

Universities that accept GPA-based systems publish their own interpretation rules.

38. Do not convert IB 45 directly into GPA without an official rule

Online tables that convert IB totals into a US-style GPA often look precise. Unless the receiving institution publishes that conversion, they are unofficial heuristics.

Submit the original qualification and let the institution apply its own process.

39. Do not convert Singapore UAS directly into foreign grades without authority

Singapore university admissions scores are designed for a particular admissions framework. They are not a general-purpose international credential metric.

Foreign institutions will specify how they read Singapore A-Level results.

40. AP credit illustrates why recognition must remain local

One university may award course credit for AP Calculus BC score 5. Another may grant placement but no credit. Another may require the student to take its own Mathematics course regardless.

The AP score did not change. The receiving policy did.

41. Course credit and degree shortening are not the same

A university may recognise prior study without allowing the student to finish the degree earlier. Credit can be elective, prerequisite, placement or exemption credit, each with different consequences.

NUS, for example, notes on its general admissions information that there is no direct credit-transfer system that simply allows prior university study to accelerate the degree for certain applicant categories.

42. Scholarship recognition is its own decision

A university may accept a qualification for admission while a scholarship has additional academic thresholds, nationality rules, bonds or selection criteria.

Use the scholarship’s own terms.

43. Employers can interpret qualifications differently from universities

An employer may care more about degree completion, professional accreditation or relevant skills than about the applicant’s secondary-school grade conversion.

Recognition is audience-specific.

44. Government or immigration recognition is a separate layer

Immigration or public-service processes may have their own credential rules. Academic acceptance by a university does not automatically establish how another agency classifies the qualification.

Use the agency responsible for the decision.

45. A universal qualification ladder would erase purpose

It is tempting to build a table with every qualification on one vertical axis from “lower” to “higher”. Broad stage comparison can be useful, but a universal ladder implies that every credential has one value independent of subject, purpose and receiving institution.

Education systems are more multidimensional than that.

46. Use a qualification packet instead of a single converted number

• Qualification name
• Awarding body
• Country / jurisdiction
• Year and session
• Subjects
• Subject levels
• Grades / scores in original scale
• Syllabus or curriculum where needed
• Language of instruction
• Official transcript / certificate
• Programme prerequisites
• Receiving institution’s published rule

This packet preserves more information than a guessed “equivalent GPA”.

47. The receiving-institution method

1. Name the exact institution and programme.
2. Find its official admissions or recognition page.
3. Select the applicant’s qualification category.
4. Check general eligibility.
5. Check subject prerequisites.
6. Check language requirements.
7. Check standardised-test requirements.
8. Check result timing.
9. Check additional tests, portfolios or interviews.
10. Contact admissions if the qualification is not listed.

This method is slower than a conversion chart and much more reliable.

48. When a qualification is not listed

Some universities include an “all other qualifications” route. Others ask applicants to contact admissions or use a credential-evaluation service.

Do not choose the nearest-looking category yourself unless the institution instructs you to do so.

49. Translation must preserve the original credential

If documents need translation, the translation should support interpretation without replacing the original qualification identity. Keep original names, awarding body and grade scale visible.

A translated “A” should not silently become an American A if the original scale means something different.

50. Qualification titles can change over time

Singapore’s transition from N(T), N(A) and O-Level structures toward the SEC is a clear example. Historical certificates remain valid historical credentials; new cohorts use the new framework.

A reference library should preserve cohort and year.

51. Old conversion tables decay

A table built before a grading reform, admissions-policy change or qualification transition can remain online long after it stops being applicable.

Check publication date and current institutional policy.

52. Artificial precision is a warning sign

Be cautious when a website claims that one foreign grade equals another to two decimal places without naming the receiving institution or methodology.

Precision in formatting is not evidence of validity.

53. Recognition can be conditional

An institution may recognise a qualification only with a minimum number of subjects, particular grades, additional standardised tests or English evidence.

“Recognised” may therefore mean “eligible if all listed conditions are satisfied”.

54. Recognition can differ by applicant status

Singapore Citizen, Permanent Resident and international applicants can face different application categories, Mother Tongue obligations, tuition arrangements or documentation.

The applicant’s citizenship and schooling context are part of the decision.

55. Recognition can differ by completion status

Some institutions accept predicted or preliminary results for one qualification but require completed final results for another. Some programmes require final results by earlier dates.

Read the column that matches whether the applicant has completed the qualification.

56. Recognition can change with policy

Universities revise admissions requirements. Examination systems change. Professional regulators update recognised qualifications.

Record a checked date for any consequential crosswalk.

57. A safe comparison table

Qualification	What can safely be said	What should not be claimed universally
SEC	Singapore secondary qualification with subject levels G1/G2/G3	One fixed GCSE/IGCSE conversion for all institutions
GCSE	UK secondary qualification using 9–1 scale in England	Grade 7 always equals one particular foreign grade
Cambridge IGCSE	International secondary qualification with subject syllabuses and board grading	Automatic equivalence to Singapore G3 for every purpose
IB Diploma	Pre-university diploma with 45-point maximum	One universal GPA conversion
Singapore A-Level	Pre-university qualification using H1/H2/H3 subject levels	Direct universal conversion to UK A-Level grades
AP	Subject exam scored 1–5	Automatic university credit
SAT/ACT	Standardised admissions tests	School-leaving qualification equivalence

58. A worked example: Singapore student with IB applying to NTU

The useful question is not “What Singapore A-Level score equals 38 IB points?” The useful route is to open NTU’s IB admissions category, check application dates, general qualification requirements, required subjects, English rules where applicable and programme prerequisites.

The institution already has a process for the qualification. A conversion invented by a third party adds noise.

59. A worked example: AP student applying for credit

The student has AP Calculus BC 5. First check whether the university accepts AP for admission. Then separately check whether the Mathematics department awards credit or placement for Calculus BC 5. These may be two different policies.

Do not assume the admissions office’s acceptance automatically shortens the degree.

60. The deeper principle: preserve the original evidence

A qualification is a structured record of what a learner studied and how performance was assessed. When we compress it too aggressively into a converted number, we lose subject depth, purpose, assessment design and context.

The best crosswalk keeps the original credential intact, adds the receiving institution’s rule and states uncertainty honestly. Comparison should help a human make the next correct decision — not create an illusion that every education system has already been mapped onto one global scale.

Frequently asked questions

Is there a universal IB-to-GPA conversion?

No universal conversion controls all admissions. Universities and application systems decide how they interpret IB results. Use the receiving institution’s published rules.

Is Cambridge IGCSE equivalent to Singapore SEC G3?

They are different qualifications. A receiving school or institution may recognise both for a particular purpose, but there is no single universal one-to-one grade conversion that should be assumed across all subjects and institutions.

Does AP score 5 guarantee university credit?

No. The receiving university decides whether a particular AP score earns credit, placement, exemption or no advanced standing.

How do I know whether my foreign qualification is accepted by NUS or NTU?

Use the university’s official qualification-specific admissions page and then check the programme prerequisites. If the qualification is not listed, follow the university’s instructions for other qualifications or contact admissions.

Official and supporting reference routes

• NUS — International Qualification Admission Requirements
• NTU — International Qualifications
• SEAB — Singapore-Cambridge Secondary Education Certificate
• World Examinations Compared
• IB Diploma Programme Explained
• Cambridge IGCSE and Singapore Secondary Qualifications
• AP Courses, Scores and College Credit