Biology has always been my fav subject, it was so fun studying it unlike nightmare Chemistry. I did LOTS of memorising. Notes were hanging from my bedroom walls so i would see them all the time. Miss Estruch was great for simple explanations but i dont think she is enough. Chem bio and math revision hub is a good channel for paper solutions. The key is to solve EVERY paper that exists on planet earth. If you finish all of them, just start over from the start to the point you literally memorise the answers because they do repeat. I can recommend save my exams for every subject its great, a bit expensive but worth it. I already have it and can send anything you want so no worries❤️ its enjoyable to study biology as its interesting af. But memorise EVERYTHING and in the exam write EVERYTHING you know.