Please see below a list of revision resources:

https://www.mymaths.co.uk/

https://www.bbc.co.uk/bitesize/subjects/zqhs34j

https://www.twinkl.co.uk/resources/keystage3-ks3/keystage3-ks3-maths/ks3-maths-secondary

KS4:

https://www.mymaths.co.uk/

https://www.bbc.co.uk/bitesize/subjects/z38pycw

https://www.twinkl.co.uk/resources/keystage3-ks3/keystage3-ks3-maths/ks4-gcse-maths-maths-ks3-ks4