Year 13

I’m going to be starting year 13 in September I’m doing chemistry, biology and statistics Alevels. I think I’ll need more structure compared to how I was going in year 12 which was maiming focusing on understanding the content and its concepts. If I got my grades in my exams next year I’d be really happy (AAA*) but I don’t fully understand how to answer the questions. I rely heaving on knowing the content. What can I do to improve this? I’ve tried continuously answering questions but I find it dull and repetitive, any other solutions?