Timed Practice
Write like it's the real thing
What the Research Says
Knowing the content is not enough — you also need to practise applying it under exam conditions. Timed practice combines retrieval (recalling knowledge), application (using the right exam structure), and time management. Examiner reports repeatedly highlight the same weaknesses: running out of time, not answering the question asked, and failing to show working in calculations. The only way to fix these is practice.
Evidence Base
| Study | Finding | Impact |
|---|---|---|
| Dunlosky et al. (2013) | Practice testing rated HIGH utility — one of the two most effective revision strategies across all research | Top-rated technique |
| Roediger & Karpicke (2006) | Transfer-appropriate processing — practising in the same format as the test produces the best results | Practice under exam conditions |
| Examiner reports | Recurring weaknesses: students don't show working in calculations, run out of time on long-answer questions, and describe instead of explain | Timed practice directly addresses these |
Step-by-Step Method
-
1
Choose a practice question — Use the practice questions on each lesson page. Make sure you know which question type it is (recall, calculation, "explain", "evaluate") so you can use the right approach.
-
2
Set your timer — Use the correct time allocation: roughly 1 minute per mark. A 2-mark question = 2 min; a 6-mark "explain" = 6 min; a 6-mark calculation = 6 min. Start the timer before you write anything.
-
3
Write without notes — Closed-book only. This is retrieval practice in exam format. If you can't remember something in a written question, leave a gap and move on. For calculations, show all working — even partial working earns marks.
-
4
Stop when the timer ends — Even if you haven't finished. Learning to work within the time limit is part of the skill. Note where you ran out.
-
5
Self-mark against the mark scheme — Use the model answers on the lesson page or your exam's mark scheme. Be honest about which marks you would and wouldn't earn.
-
6
Note 2–3 specific improvements — Don't just write "do better". Identify exactly what would gain more marks: missing a key term? Forgot to include units? Didn't link cause to effect?
When and How Often
Practise 2–3 timed answers per week in the final 4 weeks before the exam. Vary the question types — don't just practise your favourites. Use roughly 1 minute per mark and stick to it strictly.
"A transformer has 500 turns on the primary coil and 2000 turns on the secondary coil. The input voltage is 25 V. Calculate the output voltage and state whether this is a step-up or step-down transformer. Then explain why transformers are used in the National Grid." [6 marks]
Using Vp/Vs = Np/Ns:
25/Vs = 500/2000
Vs = 25 × (2000/500) = 25 × 4 = 100 V
This is a step-up transformer (output voltage greater than input voltage, more turns on secondary).
Transformers are used in the National Grid because transmitting electricity at very high voltage reduces the current. Since power loss in cables = I²R, reducing current dramatically reduces energy wasted as heat in the transmission cables. Step-up transformers at power stations increase the voltage (and reduce current) for long-distance transmission. Step-down transformers near homes reduce the voltage to safe levels for domestic use.
Calculation: 2/2 — correct method, correct answer with unit.
Step-up identification: 1/1 — correct with reason.
Explain: 2/3 — explained I²R correctly and the step-up/step-down logic, but didn't explicitly state that P = IV means same power can be transmitted at lower current with higher voltage.
Improvements: (1) State P = IV to justify why high voltage = low current for same power. (2) Include that cables have resistance — this was implied but not explicit.
Common Mistakes
-
Writing without a timer — Untimed practice doesn't prepare you for exam conditions. If you always have "as long as you need", you'll run out of time on the real thing.
-
Not showing working in calculations — Even if you get the wrong answer, you can earn method marks. A blank or "= 100 V" with no working scores nothing if the answer is wrong.
-
Not self-marking — Writing an answer and moving on wastes half the learning opportunity. Self-marking against the mark scheme is where you identify what to improve.
-
Only practising favourite question types — Students tend to avoid the questions they find hardest, which are exactly the ones that need the most practice. Make sure you practise all question types including 6-mark extended writing.
-
Forgetting units — In science, an answer without a unit is often wrong. Build the habit of always checking: does this number need a unit? (V, A, Ω, W, J, m/s, etc.)