YouTube channel Primrose Kitten has video revision sessions of about an hour for each of the sciences. It is coupled with a revision guide to work with the video. There are course specific ones- chose EdExcel or AQA- just make sure you pick 9-1 and combined options. The guide book has also been provided for students. Primrose Kitten website also has a large number of resources available for free! The YouTube channel also has demos of the core practical’s which are required for your exam.
Edexcel Core Practical's and revision.
AQA Core Practical's and revision.