Grad school prerequisites

Hey yall, I attached some of the sample problems that the masters program I’m planning on entering next year expects me to know. I have done my BS in engineering, took Calc1-3, linear algebra, diff eq, probability with calculus, and proofs. However looking at these problems I realized I can only do a few. I forgot most of my math(a refresh would be sufficient no need to study all of it) but I did forget a lot of the proofs. What’s a plan I could form to be able to complete these problems.

The program is a masters in Math & Statistics if anyone is wondering.

Author: Tasty-Conference-630