In this video, I tried to cover all of the things that are math related and are used in Competitive Programming till the Beginner and Intermediate Level.
Maths in this video is enough for getting till the purple (candidate master) level.
If you want to advance higher, you'll have to learn more things - like Probability and Expected Values, more Number Theory etc.

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Chapters:
00:00 - Introduction and Expectations
01:50 - Part 1
Number theory basics, Divisors, Multiples, Sieve, GCD, etc
30:40 - Part 2
Modulo Arithmetic, Binary Exponentiation, Division Under Mod
59:00 - Part 3
Basic Combinatorics, Counting Principles, How to find nCr%p