Cambridge C1 exam grading question

So I have recently been taking tens of practice tests in order to prepare for the C1 exam, and I can usually achieve at least about 95%~ish in the Listening tests and 85%+ in the Use of English and Reading tests. assuming I achieve the lower end of my results in the actual exam, what would my marks be out of 210, what is the minimum porcentage for C1 and C2, and how difficult is it to achieve a 180 in the Speaking and Writing sections relative to the other ones?

Any help is appreciated.