Reddit mentions of Atkins' Molecules

I think that Atkins' Molecules would fit the bill, but it's definitely not cheap.

Atkins' Molecules and Why Chemical Reactions Happen? are great reads, The latter requires A2 knowledge at least, but it's an interesting read, it introduces a few first year topics but you should be fine anyway. Atkins' Molecules is a much easier read and written so well, there's some pretty interesting molecules you'll encounter in the book as well.

There's also this textbook called A-level Chemistry by E.N. Ramsden, this textbook is pretty old most school libraries have it (my secondary school and 6th form both had it). I used it during A2 as a reference book and it has some really good questions if you want a proper challenge, only problem is that it doesn't have all the answers to the questions so you will have to go to your teacher (this is good anyway, you'll get a better UCAS ref) for the answers.