IIT Joint Entrance Exam acronym as JEE has been introduced in 2013 (replacing IIT-JEE and AIEEE) for providing admission to Undergraduate Engineering Programs at NITs, IIITs, IIT's.

IIT JEE (Main) consists of two papers:

Paper-1 of JEE (Main) will be conducted in two separate modes i.e. Offline (Penand Paper Based Examination) mode and Online (Computer Based Examination) mode.

Paper-2 of JEE (Main) will be conducted only in Pen and Paper based examination mode.A candidate will opt for either Pen or Paper Based or Computer Based examination modes for Paper-1 only.

List of books for preparation:

Physics:

University Physics by Freedman and Young
Fundamentals of Physics by Halliday, Resnick and Walker
[practice] Physics for IIT-JEE series by B. M. Sharma.

Chemistry

University Chemistry by Bruce Mahan for Physical Chemistry
Organic Chemistry by Morrison and Boyd for Organic Chemistry
Organic Chemistry by Solomons and Fryhle for Organic Chemistry
A Guidebook to Mechanism in Organic Chemistry by Peter Sykes for Organic Chemistry.

Math

Higher Algebra by Hall and Knight for Algebra
Textbook of Co-ordinate Geometry for IIT-JEE by A. Majeed for Co-ordinate geometry
Problems in Calculus of One Variable by I. A. Maron for Calculus
Calculus and Analytic Geometry by Thomas and Finney for Calculus
Vector Algebra by Shanti Narayan
A textbook of Matrices by Shanti Narayan