Increase your powers of vocabulary, calculation and logical reasoning with this book of brand new IQ tests. Each timed test is approximately the same degree of difficulty and consists of a mixture of numerical, diagrammatic and logical reasoning questions. Answers are provided with detailed explanations where necessary, together with a guide to assessing performance on each test individually, and cumulatively on all ten tests. Whether you use this book for fun or as valuable practice for improving your performance on an IQ test in the future, the ten complete tests of 40 questions each are sure to challenge and expand your mind.