Not covered below: New FM content on simultaneous equations (i.e. 3 equations with 3 unknowns).
IGCSEFM Factor Theorem
Based on the AQA syllabus.
GCSE Advanced Trigonometry 3 and 4 - Graphs and Equations
Covers both GCSE and IGCSE Further Maths syllabi, but more the latter. Graphs of trigonometric functions, and using trigonometry identities combined with graphs to solve equations.