My school is doing the Edexcel exam board and we will do Further Pure and Further Mechanics. I saw on ICL's page that Further math is put at a higher priority than Computer Science for Computer Science, so I want to learn some topics ahead of time to ensure familiarity in hopes that it will make preparing for STEP papers better.
Currently, we have only studied Complex Numbers, argand diagrams, summations (standard values), and induction proofs (not for matrices), I have also looked into roots of polynomials and volumes of revolutions.
Are there any topics that can be self taught without many prerequisites? If they have A level math content as a prerequisite I can learn that first.