Mensa: How to Excel at IQ Tests

How to Excel at IQ Tests is a complete practical course in how to boost your IQ score. It starts by explaining exactly what IQ is and how it is measured. Then moves through some of the most common types of IQ questions and how they work. You will be trained to increase not only your accuracy but also, vitally, your speed (which is the key factor in attaining a high score). 

It also gives you valuable tips on test strategy (there are plenty of people who get poor scores just because they panic and don't know the basic rules for taking an IQ test). Written by people who have unique experience of the highly intelligent; it could help you to join them.