Plan everything.
Decide which subject you're going to study and how much or how many topics you're going to study before you start studying.
Never start studying without any plan. I used to start studying without even knowing what I'm going to study and I end up not studying any topic or subject completely because of the confusion of 'where to start'.
I'm saying this based on my personal experience.
"If you fail to plan, you plan to fail."
