Science makes sense: https://www.sciencemakessense.com/
S-cool: https://www.s-cool.co.uk/
Sciber Monkey : http://www.scibermonkey.org/
KS3 bitesize: https://www.bbc.com/bitesize/subjects/zng4d2p
TES Games for grades : https://www.tes.com/articles/games-grades-collection
Education quizzes: https://www.educationquizzes.com/ks3/science/
Doc Brown's KS3 revision: http://www.docbrown.info/ks3science.htm