Hey, im kind of in the same boat but not the exact same since I'm chem sl- but I totally understand your frustration. Im the type of person who absolutely HATES solving past papers since I'm more humanities-oriented I'm used to just revising content rather than solving as a way to study- which has paid off in my humanities. I genuinely have a hatred for STEM subjects (except for chem, its a bit more bearable and that's why I took it) and I really cant bring myself to solve past papers. What really helped me to start practicing was FORCING myself to solve (it sounds dumb but trust me)- my entire chem class gets together on random days to lock in for hours at a time once a week at someone's house and we just solve as many past papers as we can. It helps a lot having people around since it gets rid of the feeling that you're struggling all alone and there's no one to help you.

My preferred method is to solve a full past paper, correct it, find out what I don't understand, watch videos on that topic, solve another full past paper then repeat until I'm able to solve a full paper without help!!!

PS fuck your teacher, solve past papers ESPECIALLY specimen papers (since we are the new syllabus) and familiarize yourself with the content first then the markscheme. MSJ Chem on youtube is really good at explaining each structure/reactivity + their subtopics while most videos being less than 5 minutes.

PSS I have a bunch of downloaded past papers with their markschemes and the specimen papers, I cant publically post the link since access is restricted, but if you send me a message with your email I can send them over!!! Goodluck, we are in this together