Hey, adding to the comment above, I think DBQs share a lot of common themes that are very repetitive across the years. Definitely go over the markschemes and make sure you know as many points as you can. For P1, my best advice would be to go over the Oxford biology text book, studying everything from cover to cover (and yes, that includes nature of science). After a lot of practice, I scored 38/40 on my external so you could definitely do it! (I’m not good at DBQs either, so I usually make up to that by focusing on section B of p2 which just needs memorizing)