Thanks for your help, I’ll get to work.
It honestly depends on what exam board you do. If you do Edexcel, you can expect some of these topics to be the hardest as they are considered Grade 8/9 level:
- Quadratic Simultaneous Equations
- Transforming Graphs y=f(x)
- Proof
- Completing the square
- The Nth Term of a Quadratic Sequence
- Quadratic Inequalities
- Velocity Time Graphs
- Proof of the Circle Theorems
- Perpendicular Lines and the equation of a tangent
- Vectors Proof Equations
^These come up in A-Level Maths which is why they are considered the "hardest"