The Learning Scientists have a series on learning how to study using scientifically researched methods. See their video above and utilize these quick and practical guides which teach you to study using:
Enjoyable Books on Evidence-Based Learning Strategies:
Teach Yourself How to Learn by McGuire & McGuire
"Teach yourself how to learn strategies you can use to ace any course at any level."
Make It Stick: The Science of Successful Learning by Brown, Roediger, & McDaniel
"Concrete techniques for becoming more productive learners."