Downloading "Problems in Mathematics by V Govorov PDF" is the easy part. The challenge lies in using it correctly. Many students make the mistake of reading the problem, getting stuck, and immediately checking the solution. This approach defeats the purpose of the book.
The chapter on proving inequalities is worth the price of admission alone. Govorov et al. systematically cover Cauchy-Schwarz, Chebyshev, Jensen, rearrangement, and majorization with problems that build intuition non-trivially. problems in mathematics by v govorov pdf