The UBD1960 Errorless Mathematics for IIT-JEE (Main & Advanced) is a totally revised and updated two-volume set for the 2027 edition, trusted by more than 25 lakh students over the last 35 years. This is the largest selling original Errorless objective practice book for IIT-JEE aspirants, strongly recommended by renowned teachers and top rankers. Volume 1 covers the Class XI syllabus and Volume 2 covers the Class XII syllabus, both strictly based on the new syllabus, guidelines, and pattern of examination by NTA. More than 80% of questions in JEE are of the same or similar type as found in this book. The set includes the latest JEE papers added chapterwise, last 38 years' papers, and ensures no repeated or similar-type questions. Full notes, short-tricks, formulae, detailed solutions, and explanations are provided throughout. Each book comes with a Trademark Certificate to guarantee authenticity. The set also includes a Smart E-book for a modern and flexible study experience, making it the top rankers' choice for IIT-JEE Mathematics preparation.