I liked watching MrBrownCS and s1perry on YouTube.
As someone who was a survivor of the atrocious OCR Paper 2 2023, I managed to nab an 8 (I was used to getting 9s but tbh after paper 2 I was relieved to have passed). I will always recommend past papers but tbh the CGP flashcards really helped too. When it comes to the coding questions (I don't know which exam board you do) make sure you read the full question and think it through before you write anything. Try think like the machine in this respect. You might want to start writing the code to take people's money, but you can't do that if you haven't got their credit card info, ygm? For everything else, I think understanding the processes helped a lot. It is hard to just memorise everything, you have to understand it. If it was layers, for instance, I would find some YouTube videos on it, then try understand, then answer some exam questions on it, then teach it all to my mum or classmate. That worked for me.
Good luck, and if you do OCR.... Good luck again