For a student of Science and Mathematics,\n learning is associated primarily with acquiring knowledge. However, learning\n also has to result in enhancement of logical and analytical thinking and\n problem-solving abilities. The ability to analyze situations through\n different perspectives and solving problems through multiple methods is also\n critical. \n \n Working with numbers, alphabets and diagrams in order to recognize patterns\n and solve puzzles of various kinds help sharpen reader’s thinking. These\n exercises help develop and strengthen mental abilities and result in improved\n thinking, agility and enhanced capability to learn. \n \n This book is a compilation of mental-ability exercises that can help high\n school students acquire and enhance their thinking and problem-solving\n abilities. It integrates important techniques from Vedic mathematics and\n other speed mathematical techniques that can help enhance computational\n abilities. \n \n We hope that this book will be welcomed by students and teachers as a good\n resource.