To prepare for the TNUSRB Sub Inspector exam, you'll want to focus on books that cover the following subjects typically included in such exams: General Knowledge : Look for books that cover a wide range of general knowledge topics including history, geography, politics, economics, . Quantitative Aptitude: Books that cover basic arithmetic, algebra, geometry, and data interpretation. Logical Reasoning: Books that provide practice questions and strategies for topics like puzzles, seating arrangement, coding-decoding, etc. General English: Grammar, vocabulary, comprehension, and writing skills. Tamil Language: Since the exam is conducted in Tamil Nadu, proficiency in Tamil language is important. Look for books that cover grammar, comprehension, and writing skills in Tamil.