I'm doing OCR History AS level (England 1509-58 and Germany 1933-63), Edexcel Economics AS level, OCR maths (C1, C2 and M1) and Spanish Pre-U.
I don't have any notes for economcis (because I've drawn the diagrams by hand so there would be no graphs) but I'd recommend these books:
for unit 1 and unit 2 (the AS units) in addition to notes/textbooks.
I found them really useful, particularly the Unit 2 one.