Okay so this is exactly what I did the months leading up to GCSE
It was like a perfect summary and also was extremely helpful since it sometimes went into detail about things the teacher wizzed through in class.
I think it's amazing because it really condensed the CGP guide where after a while they don't help a lot
I managed to get a 9 in all of my sciences this way
But bear in mind this was all done kn Yr 11 after I learnt most of the content, but yep!
And also do practice papers above all else
I used cognito to just make sure I'm covering absolutly everything - I sometimes used the gcp guide and my book of course.
Regarding the CGP guide:
I only used it in Year 10, a lot of the higher grading people in my year actually did more Cognito than CGP guides but it completly depends on you.
For some people reading helping more. But for me I eventually stop understanding the words to the pics help a lot in cognito
Sorry for the essay and good luck!