I didn’t do physics but did Chem and bio with ocr. On the CGP books it literally says ‘all you need to pass your exams’ and I found it to be a lot more simplistic than the actual textbook. I personally used CGP books mainly for understanding more difficult concepts, and I made flash cards based on the content in the textbooks. It got me A*s in both. I’d be wary about using the CGP books exclusively, but I can’t actually say for sure that you can’t get top grades with them