Should I Drop Computing? Yes, if you have no interest, and don't enjoy it, why bother?
Should I Redo All The Exams In Summer? Depends what you got last year if you're in Year 13. If you're in Year 12, maybe re-do just one of them instead of both. Doesn't realy matter, just go with a choice.
Would Universities Mind If I Did Retakes? Really doesn't matter, as long as they're good.
Would It Be Possible To Get Straight A’s Doing 7 A-Levels? Yeah, maybe.