ThemeCP
Been using this site to practice CP.
Practice with ThemeCP: https://themecp.vercel.app/guide
- Blog entry: https://codeforces.com/blog/entry/136704
If you get an AK (4 of 4 solves), increment your level by 1. Otherwise, decrement your level by 1. Remember to upsolve the easiest problem you didn’t get during the mock! This is very important.