How useful are cgp gcse revision books?

Im aiming for a grade 9 in chem and bio this year(gcses 2021) people are saying writing notes is not worth it but im not sure where i will get the information i need to know from.Does the triple science gcse cgp books have all the information i need and is that all i need to make my revision cards from?? i am really confused please help

I've finished year 11 this year and got 9s in chem & bio - I had the CGP revision guides and the AQA grade 8-9 targeted exam practice questions book. The practice question books are your best friend, they have answers in the back and show you where you get each mark which is super helpful for the higher mark questions. The revision guides are useful to make summary cards on, and I used them loads, but if you don't think they'd work for you don't worry about it. They don't have every little bit of info you need in them, but I found mine extremely helpful in making summary mindmaps/flashcards and they're good for key words and explaining things simply.
Your exam board specification on the website is really good - it's literally a list of everything you need to know. It doesn't explain it (use websites/youtube/teachers for that) but it's a big list of all the points you need to know. It gets quite specific which is good considering the mark schemes are so picky. Another thing that helps with the picky mark schemes is doing practice papers/questions then using the mark scheme and seeing the words or points you got wrong.
So yes, use the revision guides to make your flashcards or whatever but also your own notes, youtube vids if you want, anything you find useful really.

This is more general advice that's a bit related sorry lol for writing so much
In an exam you might be shocked maybe there's a question about fish gills and you've never been taught fish gills, it wasn't in the revision guide and it wasn't on the specification. GCSE sciences nowadays really love to focus on application, which is something that the CGP guide can't really teach you. You have to make a link in your head that fish gills are used for breathing, how are they like lungs? Could that link with the question? What do you know about animal cells etc - all stuff you have learnt, just applied. My teacher always said being able to apply the knowledge you've learnt to unknown contexts is what gets you the top grades.

Sorry I've made this so long lol but basically yes, the CGP guides are helpful for learning the content in a simple and easy to remember format, they have jokes and diagrams and little helpful memorising things which all helps you learn the content. 2 students could both know the exact same content but one could get a 6 and the other a 9. The difference between a 6 and a 9 is probably being able to apply it, knowing the mark scheme and exam technique rather than actually knowing the stuff, if that makes any sense at all? Hopefully that's helpful in some way, I know I could've done such a shorter answer but that's more general help for GCSEs too! Hopefully it helps a bit

Thank you so much this was very useful!!
just wondering when did you start making revision cards also when you say your own notes what do you mean because I don’t have any notes only school books with class work in them?