Reply 2
I'm predicted an A* for CS and I'll be giving my GCSE this May/June. 
I'm not doing Edexcel but in our textbook there was a lot of unnecessary info that we didn't need at all. So what I did was I opened the spec and noted down the exact info I needed for my exam. There were a lot of definitions provided in the specification as well so that helped me work smarter and faster
There are other websites that you can find online for CS that would help you as well. I think Save My Exams would be one of the best ones you could find! YT videos also come in handy, especially if you find it easier to learn and memorise things by listening!
A few good YT channels would be Mr. Bulmer's learning zone and Craig n Dave.

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