By Kirby Ng, NUS Economics graduate, teaching IB and IGCSE Economics at KS Academia Prep

Here’s the direct version: Economics grades aren’t won by knowing the content.

A parent will often tell me some version of the same thing: their child has been revising Economics for weeks — notes reread, highlighters worn down — and the grade hasn’t moved. It’s not a motivation problem. It’s usually not even a content problem. It’s that “revising” and the specific things that actually earn Economics marks are two different activities, and most students are only doing the first one.

They’re won by three narrower, more mechanical skills — precise use of terminology, diagrams that are correctly labelled under time pressure, and evaluation that reaches a judgement rather than just listing points. None of those three things improve by rereading notes. All three only improve by doing them, repeatedly, with something checking the output.

Take a mistake I see in almost every cohort: a student writes “demand for [good] increased” when the actual shift described was in quantity demanded — a movement along the curve, not a shift of it. The two sentences look almost identical on the page. One earns the mark; the other scores a flat zero, because an examiner reads it as a conceptual error, not a slip. A student can understand the difference between a shift and a movement perfectly well in conversation and still write the wrong one under exam pressure, because the two have never been drilled apart in writing — only understood in theory.

The same pattern shows up in diagrams. A demand-and-supply diagram that “looks right” — curves in roughly the right place, roughly the right shape — can still lose every mark going if an axis is unlabelled, or if a shift is drawn in the wrong direction for the scenario given. Recognising a correct diagram when you see one, and reproducing a correct diagram from a blank page under time pressure, are not the same skill. Most home revision only ever exercises the first.

This is really a retrieval problem, not a knowledge problem. Rereading notes creates a feeling of familiarity — you recognise the material, so it feels like you know it. But recognition and recall are different processes, and exams only ever test recall: a blank page, a time limit, and no notes to recognise anything against. The only way to build recall is to practise retrieving the answer without the notes in front of you, ideally under something close to exam conditions, and then have someone point out exactly where it went wrong. That’s a different activity from revision as most students do it at home — and a much less comfortable one, which is exactly why it tends to get avoided.

None of this requires more hours. A student who spends forty minutes doing three past-paper data-response questions under time pressure, with the diagrams checked line by line afterwards, will move their grade further than a student who spends four hours rereading the same set of notes. What it requires is structure: a fixed time, a quiet room, and — for most sixteen to eighteen year-olds — someone else in the room, because “I’ll do the past papers properly later” is a promise almost every student makes to themselves and almost none of them keep unsupervised.

This is precisely the gap KS Academia Prep’s Study Supervision sessions are built to close — not by re-teaching content, since that’s what the lesson itself is for, but by giving students a phone-free, supervised block where the actual doing happens: past questions attempted properly, homework finished rather than half-started, and the kind of precise, checked practice that rereading a textbook never quite produces. It doesn’t replace the teaching. It’s where the teaching turns into a grade.