A-Level:Trigonometric functions Chapter 16

Wikibooks - a good reference for what you must learn, with some worked examples

Unit circle - UTube - watch twice 16A

Radians boring voice but good
What is a radian? How do I convert degrees to radians?
Equivalent angles using trig graphs *****
Solve trig equations - using mode on calculators - degrees or radians
More difficult trig equations using substitution

A-Level: AP, GP & BINOMIAL

Wiki Books for all theory in this topic
Binomial Expansion Chapter 15
Binomial - Maths Net
Some Utube worked examples
Edexcel C2 June 2006 Q1

Arithmetic Series and Geometric Series Chapter 19
GP - Maths Net
Be able to memorise the correct formulas

Sequences and Series
Arithmetic and Geometric series sums and the nth terms With a silly Hat