Simple advice but difficult to execute: make a plan, follow the plan, only adjust when absolutely neccessary.

I'm in the middle of completely reviewing some fundamental math concepts: linear algebra, calculus, etc. Once I found the resources that I wanted to use I set out an order of execution and use a Podomoro to track my time. I'm doing everything I can to get at least one full Podomoro (1hr 40m) of study per day. I don't have kids or much responsibilities outside of work so I'm able to find the time, but still find it difficult to not get caught up by everything around me.

At the end of the day it's a matter of imposing your will and intent on a specific goal.