Full Subject-Based Banding (Full SBB) is Singapore’s secondary-school model for giving students more flexibility to take different subjects at different subject levels instead of being placed into one fixed academic stream for the whole secondary-school experience. For families searching for Full SBB, G1, G2, G3, Posting Groups or the 2027 Singapore-Cambridge Secondary Education Certificate (SEC), the most important first distinction is this: Posting Group is not the same thing as subject level.

From the 2024 Secondary 1 cohort, Full SBB has been fully implemented in secondary schools. The old Express, Normal (Academic) and Normal (Technical) stream labels have been phased out for these cohorts. Students may offer subjects at G1, G2 and G3 subject levels, while Posting Groups 1, 2 and 3 are used primarily to facilitate admission into secondary school. A student can therefore have one Posting Group at entry and still study a mix of subjects at different G-levels.

From the 2027 graduating cohort, the Singapore-Cambridge Secondary Education Certificate (SEC) replaces the separate N(T)-, N(A)- and O-Level certificates. Students sit subjects at the subject levels they offer, and the SEC reflects those subjects and levels. This page is the eduKateSingapore public current-reference owner for Full SBB facts and structure; for parent decision-making, continue to the eduKateSG Parents & Pathways Hub, and for learner-state evidence use the Sengkang Learning Atlas.

Full SBB at a glance

Question	Short answer
When did Full SBB begin?	It was fully implemented from the 2024 Secondary 1 cohort.
Are Express, N(A) and N(T) still the organising streams for new Full SBB cohorts?	No. The old stream labels have been phased out for Full SBB cohorts.
What are G1, G2 and G3?	Subject levels. “G” stands for “General”. They correspond broadly to the standards previously associated with N(T), N(A) and Express subjects respectively.
What are Posting Groups 1, 2 and 3?	Groups used to facilitate admission to secondary schools. They are not permanent labels for all subjects.
Can a student take subjects at more than one G-level?	Yes. A mixed subject profile is a central feature of Full SBB.
Can subject levels change later?	Yes, subject levels may be adjusted at appropriate points based on the student’s readiness, school guidance and applicable criteria.
What happens to N- and O-Level certificates?	From the 2027 graduating cohort, they are replaced by the Singapore-Cambridge SEC.
Does one G-level describe the whole student?	No. G-levels are attached to subjects, not to a permanent academic identity.

The first distinction: Posting Group is not subject level

Much of the confusion around Full SBB comes from treating two different systems as though they were one. Posting Groups help with admission to secondary school. G1, G2 and G3 describe the level at which a particular subject is studied and eventually assessed. They interact, but they answer different questions.

A Posting Group helps determine the student’s initial secondary-school posting and the starting subject-level profile. Once the student is in secondary school, the educational job changes. The important question becomes: At what level should this learner study each subject now, and what evidence supports that level?

A Posting Group is an entry mechanism. A subject level is a learning and assessment level. Neither should be treated as the student’s identity.

Why Full SBB changed the old stream model

The older secondary-school model grouped students broadly into academic courses. That was administratively clear, but it could hide uneven profiles. A student might be strong in Mathematics and weaker in English, or strong in language and less ready in another subject. Full SBB makes the subject-level profile more visible and gives schools more room to customise learning by subject.

This does not mean every student should always move to the most demanding level available. The useful question is not “How high can we label this child?” but “At what level can the learner build durable understanding, keep up with the real demands, transfer learning, and progress without creating hidden foundation debt?”

G1, G2 and G3: what the levels mean

MOE describes the three subject levels as G1, G2 and G3, with “G” standing for “General”. They are mapped from the standards previously associated with N(T), N(A) and Express subjects. The mapping helps families understand the transition, but the new system is not simply the old streaming structure with new labels. The key change is that subject level and overall student route can vary within one learner’s programme.

Subject level	Broad historical reference point	What parents should focus on
G1	Broadly mapped from N(T)-level subject standards	Whether the learner has secure foundations, usable language and enough fluency to progress within the subject.
G2	Broadly mapped from N(A)-level subject standards	Whether the learner can manage the conceptual, language and assessment demands reliably.
G3	Broadly mapped from Express/O-Level subject standards	Whether the learner can sustain the deeper or more demanding subject requirements rather than merely survive familiar work.

The exact syllabus, assessment objectives and paper requirements remain subject-specific. When a family needs the current examination syllabus for a particular G-level, use the official SEAB syllabus pages rather than assuming that a broad Full SBB explanation supplies every paper detail.

Mixed form classes: what changes socially and academically

Under Full SBB, students are no longer organised into form classes by the old academic stream labels. Mixed form classes are intended to create a common school experience while students take subjects at levels suited to their profiles. That means two classmates can share many parts of school life while attending different subject-level classes for selected subjects.

For parents, this changes how school conversations should be framed. Asking “Which stream is my child in?” is no longer the most useful question. Better questions include:

• Which subjects is my child taking at G1, G2 or G3?
• Why was each starting level recommended?
• What evidence would support moving to a more demanding level?
• What evidence would suggest that staying at the current level is the better learning decision?
• Where is the learner actually struggling: content, language, retrieval, pace, method, examination execution or confidence?
• What is the school’s review process and when will the next meaningful decision point occur?

A worked family example: one child, three subject levels

Consider a hypothetical Secondary 1 learner, Maya. She enters secondary school through Posting Group 2. Her strongest PSLE evidence is in Mathematics, while her English reading and written expression are less secure. Her school recommends a mixed profile: Mathematics at G3, English at G2 and another subject at a level suited to its own evidence.

The wrong interpretation would be: “Maya is a G2 student who happens to be good at Math.” The better interpretation is: “Maya has a subject profile. Her Mathematics evidence currently supports G3 study; her English evidence currently supports G2 study; both decisions can be reviewed as new evidence arrives.”

This distinction matters psychologically as well as administratively. Subject levels should guide teaching and assessment. They should not become a fixed story about intelligence, potential or future worth.

Starting levels are not the end of the story

Full SBB is designed to allow subject-level adjustment at appropriate junctures. The practical decision should be evidence-based. A student should not move up merely because a parent wants the higher label, and should not be held down merely because the starting profile was lower.

A sound readiness decision considers more than the latest mark. Useful evidence may include:

• conceptual understanding across the relevant prerequisite topics;
• retrieval after a delay rather than only immediately after revision;
• accuracy on unfamiliar questions;
• ability to interpret the language and command words of the subject;
• working speed and error rate under realistic time conditions;
• quality of explanation, working or written reasoning;
• response to feedback and ability to self-correct;
• performance when support, examples or prompts are reduced;
• workload across the learner’s full subject portfolio.

For the learner-runtime side of this decision—what the student can actually do and whether capability survives support reduction—use eduKateSengkang. This page keeps the public structure current; Sengkang owns the capability-state interpretation.

How to read a school report under Full SBB

A school report under Full SBB should be read subject by subject. A family should resist compressing a mixed profile into one label. Instead, build a simple evidence table for each subject:

Evidence	Question
Current subject level	What level is the subject currently being taught and assessed at?
Recent results	Are marks stable, improving, volatile or dependent on familiar question types?
Error pattern	Are errors conceptual, procedural, language-related, careless, time-related or caused by missing prerequisites?
Independent work	Can the learner perform without prompts, worked models or heavy home support?
Teacher feedback	What specific capability does the teacher think should change next?
Workload	Would a level change create a manageable challenge or an unsustainable total load?
Next review point	When will the decision be reconsidered and what evidence should be collected by then?

Full SBB and the 2027 Singapore-Cambridge SEC

The 2027 graduating cohort marks another major transition. SEAB states that the Singapore-Cambridge Secondary Education Certificate (SEC) will replace the separate N(T)-, N(A)- and O-Level certificates. Students sit subjects at their respective G1, G2 or G3 levels, and the certificate reflects the subjects and levels taken.

SEAB also states that the SEC continues to be jointly examined and awarded by SEAB, MOE and Cambridge International Education, and that there is no change in the overall examination standards simply because the certificates are consolidated. Families should therefore avoid the mistaken idea that SEC means one identical paper for every student. Subject level still matters.

The official 2027 syllabus pages are published separately for G1, G2 and G3 school candidates. Those pages should be treated as the current examination reference for subject codes and syllabus documents.

Transition years: why 2026 and 2027 can be confusing

Families can encounter both old and new terminology during the transition because different cohorts are at different points in the change. In 2026, the existing GCE N(T), N(A) and O-Level examinations still exist for relevant cohorts and private candidates, while the first SEC graduating cohort arrives in 2027. This is why a current guide should always identify the cohort and examination year instead of saying simply “the O-Level system has ended.”

When reading older articles, tuition pages or school materials, ask two questions: Which cohort is this describing? and Which examination year does it apply to? A historically correct page can become misleading if its time scope is invisible.

What Full SBB does not mean

• It does not mean every student takes every subject at the same level.
• It does not mean Posting Group permanently defines all subject levels.
• It does not mean G1, G2 and G3 are measures of overall intelligence.
• It does not mean moving up is always the correct goal. A higher level that creates chronic overload or foundation debt may not be educationally useful.
• It does not mean the SEC is one identical paper for all students. Students sit subjects at their respective subject levels.
• It does not mean subject-level flexibility removes standards. Each subject level still has defined curriculum and assessment demands.
• It does not mean tuition should teach a parallel curriculum. Tuition should help the learner meet the real school/subject-level demands while repairing the specific capability that is limiting progress.

Full SBB and tuition: what support should actually do

Full SBB can tempt tuition providers to market separate “G1 tuition”, “G2 tuition” and “G3 tuition” as if the label alone determines the learner’s need. A better intervention starts with evidence.

For Mathematics, the relevant limitation might be algebra, number sense, representation, method selection, careless working or time pressure. For English, the issue might be vocabulary, reading inference, language control, writing structure or oral communication. For Science, a learner may know the concept but fail to explain mechanisms or connect evidence to the question.

The subject level defines the expected learning and assessment environment. It does not diagnose the cause of a learner’s current performance. That diagnostic job belongs to the learner-runtime layer.

When a family should consider a level-change conversation

A family may want to raise the question of changing subject level when there is sustained evidence that the current level is either under-challenging the learner or creating a persistent mismatch. The useful conversation is specific:

• What evidence shows the current level is too easy or too difficult?
• Which prerequisite capabilities are secure?
• What new demands would the other level introduce?
• How would the total workload change?
• What transition support would be needed?
• When could the decision be reviewed again?
• What would count as success after the change?

The family should use the school’s guidance and current policies for the actual level-change process. eduKate can help interpret the educational implications, but it should not invent school-specific eligibility rules.

A second worked example: moving up is not always the first repair

Suppose Daniel is taking Mathematics at G2 and obtains a strong score on two school assessments. The family wonders whether he should move to G3 immediately. A good decision does not stop at the mark.

First inspect the assessment evidence. Were the questions heavily rehearsed? Did Daniel receive substantial tuition prompts? Does he retain the methods after a delay? Can he solve unfamiliar problems? Is algebraic manipulation secure enough for the next level? Is his total subject load manageable? If the answer is yes across the relevant evidence, a level-change conversation may be sensible. If not, the better move may be to strengthen transfer and independence at the current level first.

A third worked example: moving down can be strategic, not defeat

Suppose Aisha is studying a subject at G3 but is spending disproportionate time trying to survive basic tasks. Her results are weak, but the bigger problem is that the effort required in this subject is crowding out sleep, other subjects and confidence. A level adjustment may give her enough cognitive and time capacity to rebuild the underlying capability.

The decision should not be framed as “giving up”. It should be framed as a route decision: which level gives the learner the best chance to build real competence, preserve the rest of the learning system and keep future options open? If the current route has already collapsed, use the eduKateYishun Recovery Atlas to design the rebuild rather than simply adding more work.

How Full SBB connects to post-secondary pathways

Full SBB is not only a Secondary 1 placement change. It also connects to the redesign of upper-secondary certification and post-secondary admissions. MOE has announced changes connected to the SEC and later admissions exercises, including revised use of subject levels in post-secondary entry. Because these rules are time-sensitive, families should use current MOE and SEAB sources for the cohort that applies to them rather than relying on an undated summary.

For the broader parent decision route across PSLE, Posting Groups, G1/G2/G3, SEC, JC, Polytechnic and ITE, continue to the Parents & Pathways Hub. For the public map of the Singapore education system, use The Singapore Education System Explained for Parents.

Parent checklist before making a Full SBB decision

• Write down the student’s current Posting Group and subject levels separately.
• Identify which decision is actually being considered: school posting, subject level, subject combination, tuition, examination preparation or post-secondary pathway.
• Check the current official rule for the correct cohort.
• Look at evidence across more than one test where possible.
• Separate a knowledge gap from an examination-execution problem.
• Ask how much support was present when the student succeeded.
• Check prerequisites before moving to a more demanding level.
• Check total workload, sleep, motivation and the effect on other subjects.
• Define the next review date and the evidence that will be collected.
• Keep the decision reversible where the system allows it.

Common Full SBB questions

Is Posting Group the same as stream?

No. Posting Groups facilitate admission to secondary school under Full SBB. Students are not organised into the old Express, N(A) and N(T) streams, and they may take a mix of subjects at different G-levels.

Can a Posting Group 2 student take a G3 subject?

Full SBB is built around subject-level flexibility, so mixed profiles are possible. The actual starting offer and later movement depend on the relevant MOE/school rules and evidence for the learner.

Does G3 always mean better?

No. G3 is a more demanding subject level, not a universal ranking of the child. The educational question is whether the learner can benefit from and sustain that level in the context of the full subject load.

Will every student take the SEC?

From the 2027 graduating cohort, students in the relevant mainstream secondary examination route sit the Singapore-Cambridge SEC, with subjects taken at the respective G-levels. Use SEAB for the current cohort and candidate-specific details.

Will SEC remove the difference between G1, G2 and G3 papers?

No. SEAB publishes separate G1, G2 and G3 syllabus listings for the SEC. The certificate is consolidated; subject-level assessment remains meaningful.

Official sources and currentness

This guide is a public reference layer, not a replacement for MOE or SEAB. For current rules and examination documents, check the official sources directly:

• MOE Committee of Supply 2024 announcements — Full SBB implementation and SEC-related changes.
• MOE Full SBB infographic — Posting Groups, mixed form classes and subject-level examples.
• SEAB Secondary Education Certificate — SEC implementation, subject levels and certificate structure.
• SEAB SEC syllabuses for school candidates — current G1/G2/G3 syllabus routes.

As-of date: 26 September 2026. Freshness class: F3 CURRENT RULE for cohort, examination and admissions details; F1 INSTITUTIONAL for the broader Full SBB structure. Review this page when MOE or SEAB changes subject-level rules, Posting Group policy, SEC implementation, examination formats or post-secondary admissions.

Where this page sits in the eduKate federation

• This page: public Full SBB facts, structure and current-reference orientation.
• G1, G2 and G3 Subject Levels Explained for Families: deeper subject-level reference.
• eduKateSG Full Explanation of G1/G2/G3: mechanism, decisions and how the whole system works.
• Parents & Pathways Hub: family decision framework.
• Sengkang Learning Atlas: learner state, readiness, capability and transfer evidence.
• Yishun Recovery Atlas: route rebuilding when the current pathway has broken down.

Full SBB works best when families stop asking “What label is my child?” and start asking “What can my child do in each subject now, what should change next, and what evidence will tell us whether the route is working?”