Salut, if I were you I would start by watching some youtube videos, and also making mind maps- this is what I did throughout year 11 and it worked well (I think; we’ll wait and see in 19 days!). Psychologically, the best thing that you can do is learn, and then summarise, the content. Summarise! Take a page and turn it into a couple of sentences. Or a list - whatever works best for you. Looking at charts of recollection, you should aim to review content within 48 hours of learning it (maybe just a short quiz), then again after a week, then after a month! Good luck!