These videos were made for the legacy GCSE Maths Foundation tier, where the last exams were summer 2016. Although for the previous specification, they do cover a great amount of the basic material required to pass GCSE Maths in its current form.
Topics not included here that are now in the current GCSE Maths Foundation tier:
Exact values of sin(x), cos(x) and tan(x).
Error intervals in rounding.
Venn diagrams.
Trigonometric Ratios.
Standard Form.
Vectors.
Factorising Quadratics and Difference of Two Squares.