This Aptitude & Reasoning book has been designed to meet the growing requirements of candidates appearing for GATE & ESE Prelims 2020. The book also satisfies need of candidates appearing in UPSC (CSAT), Bank (PO), SSC, MBA entrance exams, and in Campus Placements of Software Companies. This comprehensive volume covers Topic-wise Theory with Solved Examples, Practice Questions, and Previous Years GATE & ESE questions of various engineering streams (CS, CE, EC, EE, IN, ME, PI etc). The book consists of total seventeen chapters with a major focus on questions from Arithmetic, Basics of Geometry, Blood Relations, Data Interpretation, Syllogism, and Critical Reasoning. We hope this book would enable the readers to acquire complete understanding of Aptitude & Reasoning.