The Second Edition of UPSC Prelims Paper 2 (CSAT) book has been made to meet the requirements of candidates appearing in UPSC Prelims 2022. This volume covers the questions of the UPSC CSAT (Civil Services Aptitude Test) of the last 28 years (1994-2021) including of latest conduct exam of UPSC Prelims 2021. For easy understanding and to provide in-depth explanations, all questions have been classified in seven major chapters and each chapter is again divided in topics, so that aspirants can adopt systemic approach of study. All chapters are prepared according to the syllabus of the UPSC Prelims Paper 2, which are basic numeracy, general mental ability, data interpretation, decision making, logical reasoning and interpersonal communication skills. The book also consists of approx. 700 questions for practice in topic-wise format, and analysis of previous years UPSC Prelims questions which is necessary for proper strengthening of subjects.