# Which topics is my child weak in? A Maths diagnostic checklist for P4–P6 parents

Source: https://test-paper.info/guides/which-topics-is-my-child-weak-in/
Updated: 2026-09-26

## Which topics is my child actually weak in?

You can't tell from a grade alone. "68 at the end of Primary 5" could mean shaky fractions, slow times tables, careless slips, or one bad afternoon — each needs a different fix. Sort every lost mark from two recent papers into concept gap, fluency gap, or time pressure; that narrows "weak in Maths" to a named topic or two.

The difference between effective help and expensive noise is specificity. Before adding tuition hours or another assessment book, it's worth an hour of honest diagnosis.

## What's the checklist for diagnosing weak topics?

**1. Get the last two papers out.** Not the scores — the scripts. Sort every lost mark into one of three buckets: *didn't know the concept*, *knew it but made an arithmetic slip*, and *ran out of time / didn't attempt*. Ten minutes of sorting usually collapses "weak in Maths" into one or two named problems.

**2. Separate concept gaps from fluency gaps.** A child who cannot start a fraction question has a concept gap. A child who starts correctly and fumbles 7 × 8 has a fluency gap. Concept gaps need re-teaching; fluency gaps need short daily reps. Mixing up the two wastes months.

**3. Check the topic, then check its feeder.** Weakness in a topic is often inherited. Struggling with [P6 Ratio](/learn/p6/ratio/)? Test [P6 Fractions](/learn/p6/fractions/) first. Percentage wobbly? Look at decimals and fractions underneath it. The [topic pages](/learn/) on this site list what feeds into what.

**4. Distinguish "never learned" from "faded".** A topic your child aced in Term 1 may quietly be gone by Term 3 — that's not a learning failure, it's [how memory works without review](https://doi.org/10.1037/0033-2909.132.3.354). The test is simple: give two questions from a topic that was mastered months ago, cold, no warm-up. If they've faded, the fix is spaced review, not re-teaching from scratch (more on that in [our spaced-repetition guide](/guides/spaced-repetition-for-primary-maths/)).

**5. Watch them solve one problem, silently.** Pick a mid-difficulty word problem and say nothing while they work. Where does the pencil stop? At the reading? At the model? At the arithmetic? The stall point is the diagnosis.

## Is there a systematic way to do this?

The manual version above works — its weakness is coverage and honesty. Two papers sample a handful of concepts out of the dozens in [each level's syllabus](https://www.moe.gov.sg/api/media/92bff26d-b2b4-4535-b868-b8415c744b91/2021-Primary-Mathematics-Syllabus-P1-to-P6-Updated-October-2025.pdf), and parents (understandably) go easier on wobbly answers than an exam would.

This is the part Test Paper automates: a free 15-minute check-up samples across every topic in your child's level, builds a topic-by-topic mastery map, and — the part we think matters most — *re-tests* fixed topics days later so you know the repair held. You get the specific list this guide is about, without the detective work. If you'd rather compare diagnostic-style options first, see our [comparison of Maths practice apps](/compare/).

[Image: Sample mastery map with made-up numbers for one Primary 5 child: 56% overall across 8 topics. Whole numbers and decimals are mastered; rate, area of triangle and percentage are strong; volume and fractions are familiar; geometry is still at the learning stage.] A sample mastery map (illustrative data, not a real child). Each topic gets its own bar and level, so the weak ones, here fractions and geometry, are the obvious place to start.