Depends what kind of a learner you are. I found history was fairly decent as I have a good memory and could remember the dates fairly well and at gcse you only need an understanding of concepts mixed with a few dates. New gcse does have a lot of topics. I didn't take geography but again there's lots to learn, but it is more science-y and does fit together well so is perhaps better if you're good at seeing the better picture or you prefer sciences.
For advice in catching up, photocopy notes and then do a shed tonne of practice questions. Best way to get your technique as good as possible. Do a couple, get the teacher to mark them, get markschemes and examiner notes (online) and use them to help. Look at examples. There's no point in doing lots of practice of the same technique. Make sure you learn every time.
Make a note of everything you don't understand and ask your teacher to explain them to you during a lunch time. Honestly you will appreciate it later.
Perhaps in terms of copying up, make revision notes rather than class notes (aka mindmaps, flashcards, whatever works best) for quicker notes and better understanding.