How to get good as grades ?

I'm less than two weeks into school and I've already done dropped a subject. I really want to do really well in them now that I'm only taking 3, but I don't know how to get revision organised, I feel that if I had revised more effectively for GCSEs I could've gone up at least a grade in most subjects it's just I have no idea what I'm doing.

Sorry about that reply i pressed submit too early. What subjects are you doing?

I'm taking Psychology, Sociology, English Literature and also History of art as an enrichment subject

I don't take those subjects but all my friends do and they got A's at AS.

In psychology and sociolgy all my friend did was wirte essays. It's such a broad subject that you can't revise everything, so just try to understand all. If you don't want to write essays then do plans, it works just the same. For organisation i can help you becasue i does essay subjects. I got an A4 folder and split it up into the units I'll be studying. Then i print of the exam specification and make your my class notes are in line with it and for revision i annotate the spec.

For English lit my friend just got enlarged versions of book pages and annotated it and wrote practice essay each night.