PSLE Subject-Based Banding: How Full SBB Gives Secondary 1 Students More Flexibility

Quick Answer: Under Full Subject-Based Banding (Full SBB), secondary school students no longer follow a single Express, Normal (Academic), or Normal (Technical) stream. Instead, each subject is taken at G1, G2, or G3 level based on the student's individual PSLE AL score for that subject. A student might take English and Mathematics at G3 while studying Science and Mother Tongue at G2 — matching instruction to readiness in each subject rather than across the board.

Full SBB represents the most significant structural change to Singapore's secondary education in a generation. For parents who remember the Express/Normal (Academic)/Normal (Technical) streaming that happened immediately after PSLE results were released, the new system can seem unfamiliar. But its logic is straightforward: instead of putting the whole child into one track based on an aggregate score, Full SBB looks at each subject separately and places the child at the right level for that subject alone.

What Is Full Subject-Based Banding?

Full Subject-Based Banding (Full SBB) is a secondary school placement system that assigns students to G1, G2, or G3 subject levels based on their individual PSLE Achievement Level (AL) scores in each subject, rather than placing them in a fixed stream. Full SBB was phased in from 2020 and fully implemented across all secondary schools by 2024. It replaces the Express, Normal (Academic), and Normal (Technical) streams that were in place since the 1980s.

Under the old streaming system, a student with a PSLE aggregate of 200 might be placed in the Express stream and take all subjects at the Express level, even if they were weak in one subject and strong in another. Under Full SBB, a student with AL 2 in English, AL 4 in Mathematics, AL 3 in Science, and AL 5 in Mother Tongue might take English and Science at G3, Mathematics at G2, and Mother Tongue at G2 — a customised combination that reflects genuine readiness differences across subjects. The student could also move to a higher subject level later if they perform well at the assigned level.

How G1, G2, and G3 Subject Levels Map to PSLE AL Scores

At Secondary 1, most students are assigned subject levels based directly on their PSLE AL scores. The school may also consider the student's overall PSLE score and posting group — there are three posting groups (PG1, PG2, PG3) that roughly correspond to the old streams — but the subject-level placement is the dominant factor. A student in PG2 (roughly the old NA group) who scored AL 4 in English is eligible to take English at G3, and schools are required to offer subject-level flexibility from Secondary 1 so that students are not locked into a single level across all subjects.

What Changes for Students Under Full SBB

The most visible change is the form class. Under Full SBB, form classes are mixed — students taking different subject combinations and at different levels share the same form class for Character and Citizenship Education, Physical Education, and other non-academic programmes. For academic subjects, they move to classes organised by subject level. A Secondary 1 form class of 30 students might contain students taking English at G3, G2, and G1, each moving to a different English classroom when the bell rings.

This change has a social benefit that MOE has emphasised: students interact daily with peers at different academic levels, which reduces the labelling and social segregation that the old streaming system created. A student who is in G2 for most subjects but G3 for English is not "an NA student"; they are a student with a specific subject profile. Over time, the hope is that "Express," "NA," and "NT" as identity labels will fade, replaced by a more fluid understanding of ability that varies by subject and can change over the secondary school years.

Subject-Level Flexibility and Movement Between Levels

Full SBB is designed to be flexible over time, not fixed at Secondary 1 entry. A student placed at G2 for Mathematics who consistently performs well — typically scoring above 75% in school assessments over a sustained period — can be considered for a move to G3. Similarly, a student placed at G3 who struggles may be offered a move to G2, though schools typically try to support the student at G3 before recommending a change.

This flexibility has implications for PSLE preparation: a student whose PSLE AL score places them at the G2 boundary for a subject has a path to G3 that does not depend on re-sitting any examination. Consistent effort in the first year of secondary school can open higher subject levels. Parents should know this pathway exists, because it reduces the pressure to see the PSLE as the final word on their child's academic ceiling.

FAQ

What is the difference between posting groups and subject levels under Full SBB?

Posting groups (PG1, PG2, PG3) determine which set of secondary schools a student is eligible for based on their overall PSLE score. Subject levels (G1, G2, G3) determine the curriculum level at which the student studies each individual subject. A student's posting group influences — but does not rigidly determine — their subject levels. Schools post students to secondary schools by posting group, then assign subject levels based on individual AL scores. A student in PG2 is eligible for G2 and G1 subjects by default, and may access G3 in subjects where their individual AL score qualifies them.

Can a student take different subject levels for different subjects?

Yes. This is the central feature of Full SBB. A student can take English at G3, Mathematics at G2, Science at G3, and Mother Tongue at G1 in a single timetable. The school arranges the timetable so that subjects at different levels run concurrently, allowing students to move between classrooms for different subjects.

Will old streams like Express and Normal (Academic) still appear on certificates?

From 2027, the Singapore-Cambridge Secondary Education Certificate (SEC) will replace the separate O-Level and N-Level certificates, and the certificate will list each subject with its level (G1, G2, or G3) rather than indicating a single stream. This change aligns the certification system with the Full SBB structure and eliminates the need for stream labels on official qualifications.

Does Full SBB mean all secondary schools now offer the same subject levels?

Most secondary schools offer G1, G2, and G3 levels across core subjects, but the range of elective subjects and the depth of offering at each level vary by school. A school that was historically Express-only may be building its G1 and G2 capabilities. Parents should check a school's subject-level offerings — especially for less common subject combinations — before finalising school choices.

How does Full SBB affect O-Level and N-Level examinations?

Under the new SEC system (starting from 2027), students will sit subject examinations at the level they have been studying — G1, G2, or G3 — rather than sitting a single-level national examination across all subjects. A student who takes English at G3 and Mathematics at G2 will sit G3 English and G2 Mathematics, with each subject result reported separately on the SEC certificate.

Summary

Full Subject-Based Banding replaces rigid streaming with subject-level flexibility. A student entering Secondary 1 takes each subject — English, Mathematics, Science, Mother Tongue, and eventually Humanities and electives — at G1, G2, or G3 level based on their individual PSLE AL score in that subject. Form classes are mixed, subject classes are levelled, and students can move between levels as their performance changes over the secondary school years. For parents, the key takeaway is that the PSLE now determines subject-level readiness rather than a fixed life-course track, and consistent effort in the first year of secondary school can open higher subject levels that the PSLE score alone might not have unlocked.