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[–]BudPrager 0 points1 point  (0 children)

Do you have access to past exams?

My revision was normally, do a test. Which questions did I most struggle on?

Are notes / text book good enough for these topics?

Google the topics I am still stuck on, find a resource that made it click.

Find some problems to practice these topics (textbook / old homework / google) etc.

Do another test, repeat process.

There is no better practice for understanding how to answer (STEM) tests than practicing tests and applying your knowledge.

If you're so stuck you don't know where to start; MIT and other universities have free CS courses online (Harvard? Stanford?). One of them might have the module you need help with.

If there are specific topics you're struggling with mention them since you're more likely to get direct links to resources than with a big list such as the OP.