Freeexampapers has 100000 papers. 10x more than anyone else.
Yep. FEP > all at the moment.
AS - Paper 1 *MCQs*, 2 *Structured Questions* and 3 *Practical* - for sciences.
Paper 2 and 4 for Mathematics (I think).
A2 - Paper 4 and 5 - sciences (you don't need these)
So for example, just download the s06 (summer 06 - meaning may june 2006) qp1 (question paper 1) for biology. That's an AS paper.
I really don't understand what your problem is (do you know what papers to do for AS or you just can't find any of them?!). Elaborate please and I'll see how I can help you.
What subjects are you giving?
pz