How to study for a test: an honest triage by time left

One principle, three timescales

Everything in this guide is one idea wearing three coats: practice the exam, not the notes. Answering questions from memory, under something like test conditions, is the highest-yield use of a study hour at every timescale; the research on practice testing is about as settled as education research gets. What changes with the calendar is how much spacing you can afford, and spacing is the multiplier. So: triage.

The night before

First, the honest part. Cramming is not a myth; massed study the night before genuinely raises tomorrow’s score, which is exactly why the habit refuses to die. The catch is the decay curve: what you cram is measurably fading within days, because nothing was spaced. Accept the trade with open eyes and cram correctly.

Cramming correctly means retrieval, not rereading. With one evening, do not run your eyes over the notes again; the fluency will comfort you and desert you at the desk. Work past questions. Blurt each topic onto a blank page and check what you missed. Rank topics by marks and hit the heaviest first: coverage beats completeness when hours are scarce. And protect the sleep. Recall runs on it, and the all-nighter is the only study method the evidence scores as reliably negative: you surrender more through fog than you gain through hours.

The week before

A week is the smallest budget where the good machinery starts to turn, because a week buys you spacing. Split the days into short sessions, one or two topics each, and make self-testing the spine of every session: past paper sections, end-of-chapter problems, or a blank-page reconstruction of the topic, checked against the source. The full method, and why producing beats recognising, is in our guide to active recall.

Two scheduling rules do most of the work. Revisit each topic at least twice with a gap between visits, because the second retrieval after a rest is where the strengthening happens. And interleave: rotate topics within a session rather than giving each its own day. Mixed practice feels messier and tests better, because the exam itself never announces which chapter a question comes from.

The month before, which is the real answer

With a month, stop optimising the emergency and run the method that makes emergencies unnecessary: short, frequent, self-testing sessions with growing gaps, started now. This is spaced retrieval, the combination with the strongest evidence in all of learning science, and a month is enough runway for it to compound visibly. The mechanics of expanding intervals, and how the schedule can run itself instead of living in your planner, are in our guide to spaced repetition; the broader ranking of methods lives in how to study.

A month is also the only budget that lets you fix foundations rather than paper over them. If practice questions keep failing at the same step, the problem is usually a prerequisite, not the topic itself, and a month gives you room to walk back and repair it properly instead of memorising around the hole.

If the test is maths

Everything above holds double for maths, where the exam is purely production and rereading buys the least of any subject. Practice means solving fresh problems, and decayed prerequisites are the usual assassin. For specific exams we keep dedicated guides: maths placement tests, the GCSE resit, and SAT math when you are starting from behind.