During the summer holidays b4 yr 11, I did study beforehand a bit.
Like what
@s_0 suggested, it's good to catch up and learn ahead for math.
Eco, I found loads of things online to study to like watching yt videos on specific topics: PPF, relationship and graphs of demand and supply, opportunity cost, factors of production, etc. Online if you search the specific topic and 'worksheet' to it, you'll be able to find questions to practice and have answers for (if you don't know what textbook your school is using).