You are not learning, also your way of practice is not clear. solve +100, +200 rating problems, solving easy doesn't make you learn anything, solving for speed is choice. try greedy maths implimentation and binary search problems you will reach pupil

• As far as I know, to get to pubil you need to be one of the fastest people to solve problems A, B of div 2 or A, B, C of div 3 (if you are slow, you have to solve 1 more problem)
• So my current strategy is to try to solve all the problems on codeforces from 1200 -> 1400. A problem is limited to 15 minutes to think about. If it doesn't work, read the solution and move on. Other problems.
• The reason it's only limited to 15 minutes is because I value quantity over quality (I want to solve 7-8 problems in this time, rather than spending 2 hours solving just one problem). , this also stems from the fact that I think our brain is a machine learning model and for it to solve a problem we have to train it with a lot of data.

P/s: Currently I have solved half of page 1 of 1200 — 1400 codeforces issues. If I complete ~12 pages and reach pubil rank, I can prove that my method is correct

Sure , I am not a mater. But I have a strategy. try to compete ind div3 and 4. also keep solvig problems that are hard for you. this will teach you and sharpen your skills