Erm...only maths. Since I'm struggling with it so far. Otherwise, my mindset doesn't work revising that much this early. Need to get a bit more accustomed to A-level, but I know I will be revising them when I need to because I certainly didn't revise as much as I could have for GCSEs.
The step-up to AS is big. But A2 is much bigger from what I've heard.