Revision guides and A Levels

Definitely. I did maths, chemistry, biology and physics and had revision guides (CGP and some other random ones for OCR) for all the sciences (wouldn't recommend revision guides for maths! They're pretty much a waste of money). I ended up not using my main textbooks at all (unless I needed them in a lesson). So yeah revision guides are pretty great at A Level too - but they sometimes don't have all the information, so watch out! Use them alongside the course specification and, if anything is missing, just look it up in your textbook or online. Good luck!