IQ and Psychometric Tests: Assess Your Personality Aptitude and Intelligence, Edition 2

Test Your Emotional Intelligence: Improve Your EQ and Learn How to Impress Potential Employers, Edition 2

The Brain Fitness Workout: Brain Training Puzzles to Improve Your Memory Concentration Decision Making Skills and Mental Flexibility

The Complete Book of Intelligence Tests: 500 Exercises to Improve, Upgrade and Enhance Your Mind Strength

1000 IQ Puzzles

IQ Gym: Grow Your Mind

Test Your IQ: 400 Questions to Boost Your Brainpower, Edition 2

Discover Your IQ Potential: Over 500 Tests of Your Mental Agility: Over 500 Tests of Your Mental Agility

The Complete Book of Fun Maths: 250 Confidence-boosting Tricks, Tests and Puzzles