I think the rule about teaching is that you need to have done the qualification equivalent or above what you are teaching. Eg, with your A level in Maths, you could teach A level and below I think that's how it works.
I doubt you'd have enough time to teach all those subjects, let alone do all the other work teachers have to do! On the off chance I would become a teacher, I definitely wouldn't want to teach below GCSE, and probably not GCSE. I guess it would be possible for you to be qualified to teach the subjects, whether you'll physically be able to is another matter!
Time would be the issue... If I had to cut down... Chemistry/French/Maths