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Physics studying sites

Where can I get some really good questions to revise online?
This is for AS-Level Physics OCR A

Always recommend it:

Sears & Zemansky's University Physics with Modern Physics

Fits very well to most A-Level/AS-Level syllabuses. It's what I used to revise and it worked fairly well, and I was able to use it in Uni 1st year, too, instead of the dreadful recommended book they slopped at us.

(It's basically AS-A-level with some extras you won't need)

Note:

The full mark scheme isn't up for the latest edition, but earlier versions have full mark schemes with guide for them (for lecturer use obviously, but you can find them online, alongside the PDF to the actual book, if you're savvy at using Google.)

Alternatively, just buy a copy (it's a damned good bargain.) The questions from the new/old version are virtually the same, just different numbers/same methods, and even then half the questions do have answers in the back of the book, good enough for me.