Essential algorithms and data structures: Suitable for all exam boards

The authors have excellent A level material available on youtube. You can probably use that and do not have to get a book. However, this book goes into lots of extra detail on data structures and algorithms which help you especially on the programming side. It's really helpful for practical implementation of structures like queues, linked lists etc. You can just dip in and out as you need it. You certainly don't need to learn the whole book.

Really good book

No practice questions all just content kinda useless