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.