Test Your IQ: 400 Questions to Boost Your Brainpower
Philip Carteris an IQ test expert and author of over 60 books covering tests, puzzles, crosswords, and reasoning.Ken Russellis an UK IQ test expert who is continually devising new IQ tests and puzzles. He is also the author ofTest and Assess Your IQandUltimate IQ Test Book(both published by Kogan Page).