i'm assuming you're going onto your second year. in your second year it is possible to take up another AS however it'd be quite hard to do it at A2 as well in the second year due to the amount of content. That being said since you'd only be doing 2 A2'S your workload would become pretty much the same as people doing 4 A2's, it's hard but not impossible. I'm not sure if you're college would let you though.