I have built $100K/yr business with SaaS, Newsletter etc. For example, at https://microsaashq.com alone I handle 500 Pro subscribers. Then got 2 SaaS platforms. And a few other products too. (May not be applicable for college or school but some pointers in general)

Below are three big things.

- Pomodoro technique really helps.

- Make your next day's todo list on the previous day

- If you have data points, Bucketize tasks based on ROI (not based on amount of efforts)

- Build systems instead of drafting goals.