I do Spanish and German and currently am at A2.
It's not a huge step up as long as you keep up with vocab and grammar rules. At first, it can be quite tricky, but you quickly get the hang of it. Orals are particularly scary, but by the end of the year it becomes very natural talking off the cuff, and they last only 10-15 mins for me (20-25 mins would be a bit much).
If you wanna do it, go for it. It's a subject many say is hard at A-Level, but if you're naturally good at/interested in them then it's a breeze (especially when it comes to revising for the exams - by far the least amount of revision needed for them!)