Last year, there was a girl student from San Jose Mission School having trouble with geometry. She started taking lessons from me during the middle of the academic year because she was struggling with geometry proofs. Immediately after beginning, I told her some important points/hints about proofs in geometry and suggested her to write at least one proof daily.
She listened to my advice and wanted to work on it, but somehow was not able to make it a practice since proofs are difficult. Then I started calling her daily at around 7:00 PM reminding her about doing one proof each day. She had no other alternative but to do the same. This helped her a lot.
After continuous follow-up, she started writing one proof on a daily basis. Soon, she became a master of geometry and started getting A's on her tests!