I have read many books on studying and getting good grades. Most of these books have idealistic fancy solutions that work for a while until my motivation wavers. To restart these methods requires intensive work.
Then I came across Study Hacks.
Here's an article from the site:
The Straight-A Method: A Simple Framework for Conquering College
I even bought his two books,
How to Win at College and
How to Become a Straight-A Student.
His methods are nice because they are
a) Simple: even if you stop them, it's super easy to restart them once you get back on track
b) Tested: he used them, he chronicles various students testing his methods on his blog.
c) Effective: they teach you to learn holistically, they teach you not to cram, they teach to you gain something from college academically while not giving up your social life and other opportunities. they teach you to live a balanced life.