I wish to take the following subjects: Maths, Further Maths, Physics, Chemistry, History, Economics. Is this combination manageable? I know it's uncommon to take 6 subjects but I'm willing to put in effort. I have reasons for wanting to take all these subjects (need Maths, Physics and Chemistry because I want to do engineering, need Further because I'm participating in an Olympiad where a lot of mathematical knowledge is required, and similarly specific reasons for the other two as well).
I know top UK unis only ask for 3-4 subjects but I'm not from the UK and I'm not applying to UK unis. I'm applying to top US colleges that value rigorous academics. BTW my GCSE (O-Level) predicted grades are 12A* 2A (although I know that GCSE performance is not really indicative of A-Level performance).
So yeah, will I be able to manage this? And how hard will I have to work to maintain As/A*s? Like how many hours per day of studying? Thank you!