GCSE study books as an adult

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Im unsure if this seems strange to anyone, but I absolutely love doing puzzle books all kinds. I mainly love the number puzzles; I was always obsessed with maths at school. I'm running out of things to do and considering buying myself a few different subject GCSE CGP books. I passed all my GCSEs so there's absolutely no reason to do this other than something to occupy myself in the evening. Does anyone else do this?

Also any puzzle book people, I'd love some more recommendations?

I cant think of any to recommend right this second but yes I love doing this so if I think of any I will post later

What sort of puzzles? Like sudoku?

I like buying one of those mixed puzzle magazine type books from Sainsbury's for summer holidays, ones which have a mix of word searches, sudoku, crosswords and other puzzles like that.

If you want something tougher, GCHQ do good puzzle books https://www.amazon.co.uk/GCHQ-Puzzle-Book/dp/0718185544

Professor Layton series on Nintendo DS.