There have been many memory courses and systems taught over the last couple of centuries. I personally liked, "How to Develop a Super Power Memory," by Harry Lorayne. It's old but good, and you only have to read it once. (!!!) http://www.amazon.com/How-Develop-Super-Power-Memory/dp/0811901815
There are many others: One of my favorites for studying is, "Brainbooster" by Robert Finkle. It helps organize your memory system specifically for studying. http://www.amazon.com/New-Brainbooster-Hours-Learning-Remembering/dp/0802773524/ref=sr_1_6?s=books&ie=UTF8&qid=1389726169&sr=1-6&keywords=brainboosters
I have over thirty how-to books on memory and learning that revolve around mnemonics. They all teach pretty much the same thing,, and some of them may appeal to you more than others, so check around. The books by Tony Buzan are pretty good, and some of them teach skills besides memory that apply to study.
The book, "Find Your Focus Zone," by Lucy Palladino is terrific, and includes insights into how the brain works and how to make it work better. http://www.yourfocuszone.com/
A lot of people don't study well because they don't take care of their body. I highly recommend, "The Four Hour Body," by Timothy Ferriss. As for learning, His book, "The Four-Hour Chef" is more about learning than cooking. (Tim did a show for Discovery called, "Trial by Fire" which followed him while he learned martial arts skills (Yabasume) equivalent to 20 years' ordinary practice in only about 4 months. He has a background in neuro science, so he seems to have access to a lot of cool resources.) http://www.amazon.com/4-Hour-Body-Uncommon-Incredible-Superhuman/dp/030746363X/ref=sr_1_1?s=books&ie=UTF8&qid=1389726764&sr=1-1&keywords=4+hour+body+by+timothy+ferris
Again, the connection between brain and body; "Change your Brain-Change your Body" by Daniel Amen. This is very much about Brain Fitness, but also syncs the health and fitness connection. http://www.amazon.com/Change-Your-Brain-Body-Always/dp/0307463583
For fun read, "Moonwalking with Einstein," by Joshua Foer. It is an overview of the culture of people who train their memory for serious competition. http://www.amazon.com/Moonwalking-Einstein-Science-Remembering-Everything/dp/0143120530/ref=sr_1_1?s=books&ie=UTF8&qid=1389726982&sr=1-1&keywords=walking+with+einstein