Additional websites that I have used regularly are below:
https://whiterosemaths.com/homelearning?year=year-9
https://www.ilovepdf.com/split_pdf
https://www.tes.com/member/niccook
https://nixthetricks.com/Download.html
https://corbettmaths.com/5-a-day/gcse/
https://b28mathstutor.co.uk/clueless-about-calculators/
https://education.casio.co.uk/calculators/classwiz-product-range/
Y9U1 KO
Numbers
Irrational numbers
Y9U2 KO
Using Percentages
Reverse percentages
Y9U3 KO
Maths & Money
Simple interest
vs
Compound interest
Y9U4 KO
Ratio & Proportion
Inverse proportion
Y9U5 KO
Congruent Transformations
Transformations
Y9U6 KO
Enlargement & Similarity
Enlargement
Y9U7 KO
3D shapes
Plan and elevations
Y9U8 KO
Straight Line Graphs
y = mx + c
Y9U9 KO
Quadratics and Other Graphs
Quadratics
Y9U10 KO
Compound Measures & Rates
Speed comparison
Y9U11 KO
Probability
Monty Hall problem
Y9U12 KO
Forming & Solving Equations
Solving inequalities
Y9U13 KO
Pythagoras' Theorem
Visualising
Y9U15 KO
Constructions & Congruency
Loci and simple Construction
Y10U1 KO
Non-calc Methods
Limits of Accuracy - Calculations