Computer Science Help?!?! Watch

There's always going to be some stuff which you could memorise (e.g. Legal/Ethical issues, network protocols, etc.), but I wouldn't advise trying to memorise topics like programming or algorithms because those are more about your computational thinking and problem solving skills, and learning to understand the programming language so it's a lot more skills-based.

The only way to really be competent in those skills is to keep on practicing and actually spend plenty of time solving problems in code -- it's a bit like working out; the more you do it, the better trained you'll be at it. But just as with real exercise, it gets harder if you don't do it very often.

There's loads of practice problems to try here: https://www.ocr.org.uk/Images/260930...es-booklet.pdf
(It doesn't matter if you're on a different exam board, the coding challenges would be good for anyone trying to practice/improve their programming and problem solving skills)