How to revise A-Level Chemistry when the notes aren't sticking

Start with the mistake, not the chapter

If you recognise everything in your notes but struggle with a question, another full read-through may not address the problem. Start with a short set of questions on one topic, attempt them without the notes, and identify exactly where you get stuck.

Separate a missing fact from a missing explanation, an incorrect calculation method and a misread instruction. Those problems need different repairs. Our suggested routine below is a starting point: adjust the time to the difficulty of the topic.

• Choose one small topic, such as ionisation-energy trends rather than all of atomic structure.
• Attempt a few questions without looking at a worked answer.
• Mark them using your board's guidance and name the reason for each lost mark.

Turn facts into explanations

Close the notes and explain the idea in your own words. For a trend question, identify what changes, which particles or forces are involved, and how that change produces the result. A list of scientific terms is not yet an explanation.

For example, when explaining why first ionisation energy generally decreases down a group, connect the greater distance and increased shielding of the outer electron to weaker nuclear attraction. Then connect that attraction to the energy needed to remove the electron. Check the exact comparison the question asks you to make.

Make your corrections usable

An error log should help you answer a new question. Instead of writing 'revise moles', write 'convert cm³ to dm³ before using concentration in mol dm⁻³'. Include a corrected example and explain why the original method failed.

Try this 40-minute session. Spend five minutes recalling the key ideas, ten repairing one gap, twenty attempting and marking questions, and five scheduling a follow-up. The timings are a suggested routine, not a required formula.

• Write the equation or relationship before substituting numbers.
• Keep units beside quantities and show the chemical mole ratio.
• Explain what each step finds, then check whether the final answer is plausible.

Check whether the repair transfers

Return to the error later without the solution in front of you. Then attempt a different question that uses the same idea. Repeating the original answer from memory does not show that you can apply the method in a new setting.

Use your own exam board's specification to define the content you need. When reading a mark scheme, distinguish a rule for that particular question from a general chemical principle. Keep a record of recurring mistakes and let that record decide the next session.