Yes there are so many site provided Free online test series for IIT JEE, here as you asking I am telling some good books name of this exam :


Physics :::

Understanding Physics Jee Main & Advanced Mechanics Part-1: (2016 Revised Edition) Book By DC Pandey

Books by D C Pandey

Concepts of Physics - Vol. 1 Book By HC Verma

Concepts of Physics - Vol. 2 Book By HC Verma

Handbook of Physics Book By Arihant

Maths :::

Objective Mathematics For IIT-JEE, AIEEE and All Other Engineering Entrance Examinations (Set of 2 Volumes) By RD Sharma

Play with Graphs for JEE Main & Advanced Book By Amit M Agarwal

37 Years' Chapterwise Solved Papers (2015-1979) IIT JEE Mathematics Book By Amit M Agarwal

Handbook of Mathematics Book By Arihant

Chemistry :::

Handbook of Chemistry Book by Arihant

New Pattern Textbook of Organic Chemistry for Competitions IIT-JEE and All Other Engineering Entrance Exams Book

Wiley's Solomons & Fryhle's Organic Chemistry for JEE (Main & Advanced) Book

Objective NCERT at Your Fingertips Chemistry Book

Modern Approach to Chemical Calculations Book