I took the GCSE and A level within one year. Got an A* at GCSE, an A at AS level and an A at A level. I'm now a third-year undergraduate and I study Japanese at uni.
It totally is! I'm not sure if OP means they learnt it all in one year to A level or sat GCSE and A level within 1 year of eachother, but i did the latter and it went okay!
OP is very dedicated and worked really hard for those stunning grades, good on you OP! <3