All of the links below work best if you download the PowerPoint file, rather than viewing through Google Slides. All resources are those I have used to teach, so they’re mainly my own with the odd slide / photo / image / question set that I’ve borrowed from elsewhere, and are provided here as a revision aid for students.
Science Exam Technique:
New! How to tackle simple calculation questions in Science
How to answer 6 mark questions in GCSE Science
May 2016 “Walking Talking Mock” which shows you how to approach the different types of question in a GCSE Science exam.
Edexcel publish their past papers here.