Are you looking to self-teach the same A levels?
I've self-taught a few subjects myself, and if you tell me the subjects and exam board, I can recommend some books. Don't feel overwhelmed though. I did when I first started as there was so much to learn, but remember you have a fair amount of time to learn the content. Also, if there are topics you don't understand, chances are myself or someone else here is able to help.
Good luck, and feel free to PM me if necessary.