I was in the same situation as you this time last year and I used CGP, they are AMAZING books. They are literally written with the exact wordings off of the mark schemes, and they include about 90% of the info you need to know (the other 10% can be picked up with practise questions) . The textbooks just waffle, giving you about 300% of the info you need to know, mostly just being clustered with random , pointless facts. Although , I will admit, sometimes the CGP don't emphasise details to be important , but that doesn't mean they miss the details out, it just means they might be in small print below a diagram (very rarely do they do this though)
If you don't believe me, try it yourself. Btw I got As 80% of the time in biology and about 70% of the time in chemistry .
I used Chemguide for my chemistry to go over harder stuff, but I wasted a lot of time trying to understand stuff at uni level which is pointless as I don't even plan on taking my A levels at uni...
Just CGP it and then use practise questions. But for maths use the textbook as the best way to revise maths is just by immersing yourself in practise question after practise question.