The main purpose is to allow students to catch up material they have missed – which is why there are often notes included in them for students to take down – or revise before an assessment.
This page does not have the videos embedded, to save on download time and make the page easier to navigate. Instead the links open a new page in YouTube (or similar).
De Moivre's Theorem
Exact Forms of Polar Representation
Writing Conics Equations
Solving Conics Problems
Writing equations suitable for solving
Solving using algebra in standard forms
Solving using algebra in parametric forms
Graph mode on graphics calculators
Conics mode on graphics calculators
The Maths OSC channel at YouTube
has quite a few relevant videos on the skills required for this year.
Three Blue One Brown
is very good for Scholarship students, or those who want to see the "why" of Calculus, not just the "how".