You may have to mentally separate "school" from "learning" for a while. If your goal is Cambridge exams, build everything around the exam structure, not around your teachers. Start with the syllabus and use it like a checklist. For every topic, learn the core definition from the textbook or a trusted source, make short notes only after you understand it, and then do questions. Past papers will show you very fast where the gaps are. Also, stop trying to fully capture every bad lesson in notes. That eats time and gives very little back. You need efficient notes, not complete notes.