If you mean a well-known book like "Problems in Mathematics" by et al. (often a Soviet/Russian problem book for advanced high school or Olympiad prep), I can review that. Let me know, and I’ll give a detailed assessment.
Problems In Mathematics With Hints And Solutions : V. Govorov
If you mean a well-known book like "Problems in Mathematics" by et al. (often a Soviet/Russian problem book for advanced high school or Olympiad prep), I can review that. Let me know, and I’ll give a detailed assessment.
Problems In Mathematics With Hints And Solutions : V. Govorov v govorov mathematics pdf