Unlimited Memory - Kevin Horsley (2014)

The book has two sides to improving memory.

1. Improving life style to be able to do the right things - like being focused etc. 
2. Memory improvement techniques - This is a great takeaway in this book. However, not all techniques are enjoyable or fun to practice. However, a lot in this book can be achieved through practice. You may already have few of similar techniques already in practice. 

Some startling facts, 82% of the knowledge gained preparing for examination is lost at end of a moth or so. Technically, what you studied will not add much value unless you practice. 

Good read. But achieving great unlimited memory is long, arduous journey.