All in all As exams are generally taken in May and A2s in June unless they have exceptions?
I'm retaking F322 (AS chemistry unit 2). I'm also taking FP2, FP3, FP4, M2, S2, F324, F325, F214, F215, G484, G485, STEP I, STEP II, STEP III, 3 IGCSE exams.
AS exams are generally in May to mid June and A2 exams are generally in June, but there are numerous exceptions to this trend. You can't make general claims about the timings of all exams.