NOTES · FULL SBB
Full SBB and Sec 1 maths: G2 or G3, and moving up
Method & Mark ·
Under Full Subject-Based Banding, a child’s posting group sets the level most subjects start at in Sec 1, and the PSLE Maths AL can lift maths to G3 on day one. After that, moving up depends on school results and the school’s judgement. G2 maths covers in Sec 2 much of what G3 covers in Sec 1, so a later move up means a gap to close.
What Full SBB replaced
From the 2024 Sec 1 cohort, the Express, Normal (Academic) and Normal (Technical) streams were replaced by Full Subject-Based Banding. Students are admitted through Posting Groups 3, 2 and 1, which map to the old streams’ PSLE Score ranges, and then take each core subject at G3, G2 or G1.
- Mixed form classes. About a third of curriculum time is spent with a form class drawn from all posting groups, taking Art, CCE, D&T, FCE, Music and PE at a common level.
- Core subjects by level. English, Mother Tongue, Mathematics, Science and Humanities are taught at the student’s level for each subject, in separate classes.
- Not every school. Integrated Programme schools, Crest and Spectra admit from one posting group and do not run Full SBB, though some subject-level flexibility may apply.
MOE’s position is that the posting group only decides admission and starting levels. Which post-secondary routes are open depends on the subjects and levels a student ends up with.
What decides the maths level on day one
| Posting group | Most subjects start at | Maths can start at |
|---|---|---|
| 3 | G3 | G3 |
| 2 | G2 | G3 with Standard Maths AL 5 or better, otherwise G2 |
| 1 | G1 | G3 with AL 5 or better, G2 with AL 6 or Foundation AL A, otherwise G1 |
MOE’s own example: a PSLE Score of 23 with AL 5 in Mathematics means Posting Group 2, most subjects at G2, and Mathematics at G3 from the start of Sec 1. A Posting Group 3 student who took Foundation Mathematics at PSLE may, with the school, take maths at a less demanding level instead.
How the AL and PSLE Score are worked out, and which score leads to which group, is in PSLE AL score for secondary school.
How G2 and G3 maths differ in Sec 1
Both follow MOE’s 2020 G2 and G3 Mathematics syllabuses. Much of Sec 1 is shared: primes, HCF and LCM, negative and real numbers, estimation, percentages, rate and speed, perimeter, area and volume of prisms and cylinders, and reading statistical diagrams. G2 adds smaller steps in ratio, percentage and speed, such as relating ratio to fractions and finding speed from distance and time.
The difference is mostly in algebra and graphs. Four areas sit in Sec 1 for G3 and in Sec 2 for G2:
| Area | G3, Sec 1 | G2, Sec 1 |
|---|---|---|
| Algebraic expressions | Fractional coefficients, such as 2x/3 − 3(x − 5)/2, and taking out common factors. | Whole-number coefficients only, such as 4x − 2(3x − 5). Fractions and factorising wait for Sec 2. |
| Equations | Fractional equations, such as x/3 + (x − 2)/4 = 3 and 3/(x − 2) = 6. | Linear equations with whole-number coefficients. Fractional equations wait for Sec 2. |
| Graphs | Cartesian coordinates, linear functions y = ax + b, and gradient. | None. All of it waits for Sec 2. |
| Polygons | Special quadrilaterals, regular polygons, interior and exterior angle sums, and constructions. | Angles and properties of triangles only. The rest waits for Sec 2. |
The gap then widens. G3 Sec 2 adds quadratic graphs, solving quadratic equations by factorisation and the trigonometric ratios, none of which is in G2 Sec 2. Both levels factorise quadratic expressions and solve simultaneous equations in Sec 2, but G2 does it without the Sec 1 groundwork G3 already has.
Two G3 Sec 1 questions, worked
Both come from the G3 Sec 1 list. Neither appears in G2 until Sec 2, so they show what a student moving up has to be able to do.
The common denominator is 6, so the first term is multiplied by 2 and the second by 3. The slip to watch is the sign: the minus in front applies to the whole of 9(x − 5), so −9 × −5 gives +45. Check with x = 3: the question gives 2 − 3(−2)/2 = 2 + 3 = 5, and the answer gives (45 − 15)/6 = 5.
The unknown is in the denominator, so multiply both sides by the whole of (x − 2) and keep it in a bracket. Check: 2.5 − 2 = 0.5, and 3 ÷ 0.5 = 6. Each line is a step an examiner gives a mark for; see how method marks work.
Moving up a level after Sec 1
MOE sets the principle and leaves the details to schools:
- Moving up depends on the student’s results in that subject in secondary school and a holistic assessment by the school that they can cope with the subject and the overall workload.
- The timing is “at appropriate junctures”, decided by the school, which advises each student on eligibility. For Humanities, MOE says schools typically explain the criteria in Sec 1 briefings at the start of the year or on their websites; ask for the same about maths.
- Moving down in a compulsory subject such as maths after the start of Sec 1 needs the school to weigh the student’s aptitude, attitude, well-being and the effect on post-secondary options.
- Moving everything up, once called a lateral transfer, is still possible.
A student who moves from G2 to G3 maths at the end of Sec 1 joins a class that has already done the four areas in the table above. One who moves at the end of Sec 2 also joins without G3 Sec 2’s quadratics and trigonometry. Neither is out of reach, but the school will be looking at whether the student can close the gap, and that is mostly algebra.
Why the maths level matters later
- Junior college. MOE’s example is a Posting Group 2 student who takes enough subjects at G3 to compute L1R5 and reaches 20 or better. The level of each subject matters, not the posting group. See how L1R5 and L1R4 are calculated.
- Additional Mathematics. A Math is an upper-secondary elective, with separate G3 and G2 syllabuses, and the school advises who can take it at which level. It builds directly on lower-secondary algebra. See Additional Mathematics.
- The 2027 exam. G3 Mathematics is examined in the SEC from 2027, in place of O-Level E Math. See O-Level to SEC.
What to do in Sec 1
- Ask the school for its criteria at the start-of-year briefing: what results it looks at, and when it reviews levels.
- If your child is at G2 and aiming for G3, work through the four areas in the table during Sec 1 rather than waiting for them in Sec 2.
- If your child is at G3 from a G2 posting group, watch the algebra in Term 1. Fractional coefficients and equations arrive early and set the pace for the rest of the year.
- Make every line of working visible. It is what earns marks when an answer goes wrong, and it is what a teacher reads when deciding whether a student can cope.
Sources
MOE, Full Subject-Based Banding FAQs, What you need to know about Full Subject-Based Banding, Schools offering Full SBB and What are posting groups. MOE, G2 and G3 Mathematics Syllabuses, Secondary One to Four (2020 Secondary One cohort onwards), Content by Levels for Secondary One and Two. Details can change, so check these pages before making a decision.
How we teach for it
Our Sec 1 Headstart is a first go at the algebra that opens G3 Sec 1: expansion, factorisation, substitution, algebraic fractions and linear equations. From January, Sec 1 students at G2 or G3 can join our Mathematics (E Math) classes, where every line of working is marked the way an examiner marks it. Message us on WhatsApp or book a trial class.