/sci/ - Science & Math

Serious question,
How can i achieve this. Im relatively smart in the sense that i virtually can understand everything shown to me so far. However i dont have the discipline and i have a drug habit of smoking weed. Im slowing down on that habit though and i should be done with it in the next months. However i realized sometimes i fall on it because im really boring or just dont feel like my time is worth going into some particular task.
So i really like to understand physics concepts and plan on becoming an engineer. However i really want to master math. Ever since i have memory i dont have problems with science and used to compete.

Is there a serie of topics i should study in order? What do you guys recommend?

Pic unrelated