english lit & lang, maths, sciences & you said re are compulsory. leaving further maths, spanish, history, engineering & it; i believe. correct me if i’m wrong.
personally, i’d only do further maths if you definitely enjoy maths. if not, maybe not. but it’s not up to me, it’s up to you.
which of the subjects do you enjoy most? i’d strongly suggest taking the ones that intrigue you most. right now, career options don’t matter so much, it’s a level you have to consider it in a bit more depth. so my advice is go with your favourite ones 😊