Every AI tutor in Singapore says it’s “MOE-aligned.” That’s table-stakes now. The real test is whether the tool actually holds up when your P5 or P6 child throws a real PSLE-style question at it.
Here are five topics where most AI tutors quietly break — and the exact way to pressure-test each one before you pay for a month.
1. Fractions of a Remainder
The killer pattern: “Ali spent 1/4 of his money on a book and 2/5 of the remainder on a meal. He had $54 left.”
PSLE markers love the word remainder because it’s where chatbots slip. A weak AI treats “2/5 of the remainder” as 2/5 of the original. Type the question. Watch the working. If the AI doesn’t explicitly say “the remainder after the book is 3/4 of the original,” it’s pattern-matching from training data, not teaching your child the move.
2. Ratio with a Changing Quantity
PSLE loves “before and after” ratio problems. “The ratio of boys to girls was 5:3. After 12 boys left, the ratio became 3:2. How many girls were there?”
The trick: girls didn’t change. AI tutors that don’t anchor on the unchanged quantity will scramble the unit value. Make the AI show its working line by line. If it can’t articulate “girls stay constant, so we rescale to equal girl units,” it isn’t teaching — it’s guessing.
3. Percentage — Discount and GST
Real PSLE-style: “A bag costs $80 after a 20% discount. 9% GST is then added. What’s the final price?”
Two traps live here: reversing the discount (kids do $80 × 1.2 instead of $80 ÷ 0.8), and applying GST to the pre-discount price. A good AI restates the question, names both traps, then solves. A bad one fires back a number and moves on. Ask a follow-up: “What was the original price before the discount?” A weak AI guesses. A strong one asks which price you mean.
4. Speed — Multi-Stage Journeys
“Tom drove from A to B at 60 km/h, then from B to C at 90 km/h. The whole journey took 3 hours and covered 210 km. How long on each stretch?”
This is where AI tutors fail loudest. The naive shortcut is to average 60 and 90 to get 75 — wrong, because the time on each leg differs. If the AI averages speeds without going through total distance ÷ total time, your child will learn the same mistake. Throw average-speed problems at any trial — they expose shallow models faster than any other topic.
5. Geometry — Composite Figures and Circles
A square with a quarter-circle cut from one corner. Use π = 22/7. Find the shaded area.
The test isn’t whether the AI gets the number right — it’s whether it can describe the figure in words, then walk through subtracting one shape from another. Most lower-primary chatbots cannot. PSLE-targeted ones often get the area but mangle the labelling — they say “the quarter-circle” without saying which corner, and your child loses the diagram halfway through.
The Drawing Test That Sits Behind All Five
PSLE problem sums are bar-model territory. A pure text AI can describe a bar model. It cannot draw one, and your child cannot draw one back. A multimodal tutor with a drawing canvas lets her sketch the units, get them corrected, and build the visual intuition the MOE SLS curriculum was built around.
Before you subscribe, throw a bar-model question at the trial. If the AI describes the model but cannot render it, your P5 is still going to need pen-and-paper coaching from you — which defeats the point of paying.
Run the 30-Minute Trial Yourself
Open the free trial. Run these five questions in order. Note which ones the AI answers with full working, which it answers with just a number, and which it quietly gets wrong.
Twenty minutes of testing now saves a year of “why isn’t his Math improving.” That’s the difference between an AI tutor and a textbox that happens to know how to multiply.