i did comp sci and geography

for geog i'd recommend planning lots of long mark questions (the big ones at the end of each section) to make sure u know the structure (PEEL worked best for me) and have some stats u can use to back up examples. i use physics and maths tutor for literally all of my practice papers, and they also have summary guides for each of the topics which i found were good, esp for sciences. geography is rlly tough bc of the timings (1 minute per mark is brutal TwT) so i'd defo recommend doing some timed practice questions or full papers to make sure u stay on top of it.
for computing, do loooaaadsss of coding practice for the coding paper, there's rlly no other way of improving. for the knowledge paper, do lots of practice papers bc the questions tend to be rlly reptitive between years and they just swap out a few words/ numbers
good luck!! you've got this :]