Four weeks is enough time to prepare well if you plan it properly. Here is how to split it.
Week 1: map the syllabus
List every topic and rate your confidence. Book study blocks for the weakest areas first.
Week 2: learn actively
Summarise each topic on one page and make flashcards for facts and formulas.
Week 3: practise under exam conditions
Do past papers against the clock and mark them honestly.
Week 4: polish and rest
Go back over mistakes, keep the last day light and sleep well.
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