A training plan at the Computer Science Center?

Question

Mathematics

Hello! I want to enter the Computer Science Center this year. I am in my second year of software engineering at ITMO. From mathematics, the matan from what is required is more or less covered, and linal up to eigenvalues. In all other respects, knowledge, roughly speaking, is zero.
List of topics: https://compscicenter.ru/enrollment/program/
Variants of past years: https://yadi.sk/d/PMdV1XwxUwNqGQ

What training plan and what resources could you advise me? Kostrikin is not at all easy for me (and, I'm afraid, according to the recommended literature, I will not have time to prepare at all). If you have any recommendations on who to contact for help, I would also like to know.