Mathematics required for solving problems

Hello everyone ,
Can somebody list out the mathematical topics and resources which one needs to master in order to solve problems completely based completely on mathematics . I face much difficulty in solving formula based problems especially combinatorics and series based problems .

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If u have just started with cp then i would love to share how things eventually got better for
me understanding mathematics concepts (ans needless to say i suck at maths :/). Most of Medium
cp problems are based on one or combination of maths concept like Primes Sieve, Modular Arithmetic, CRT, Combinatorics etc. Whenever you get stuck at problems all you need to do is search a lot on internet, read different blogs and get clear with concepts related. If possible you can make simple short notes which can tell, how u can use that concept. sooner or little l8r u’ll see change.