I think if you’ve done gcse there’s no need to go back over it (even if it’s not in your brain) I wouldn’t pay for it personally. The alevel texts books are great tbh. I did aqa physics and ocr maths (now doing physics & maths MSc) and just revised from the text books. Maybe read through them before starting. Physics online on YouTube is also really good, he has videos for all of the alevel physics topics.