I don't know what to do ?

I really love A-level maths, but this year i flopped my C1, despite me getting A's in past papers consistently, in C2 i think i did fine, but in D1 i think i got a U because i ran out of time. What should i do should i carry on doing maths a level or should i drop it next year, and i don't know if i should because on one i really have a passion for it, but on the other I think im gonna get a U or E.