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NCERT is the most important book for JEE Main preparation, however, there are reference books that have some concepts explained in a better and comprehensive manner.

JEE Main best books for reference are as follows-

Mathematics-

• Trigonometry; 103 Trigonometry Problems by Titu Andreescu & Zuming Feng by S.L.Loney, Titu Andreescu & Zuming Feng

• Co-ordinate Geometry by S.L.Loney

• Higher Algebra by Hall Knight+ Bernard-child

  Problems in Calculus of One Variable Algebra by I.A.Maron

• Algebra by Arihant

  Recommended

• Differential Calculus by Arihant

• Integral Calculus by Arihant

• Complete Mathematics for JEE Main by Tata McGrawHill (TMH)

Mathematics Books for JEE Advanced Preparation-

• Objective Mathematics By R.D. Sharma
• Plane Trigonometry and Coordinate Geometry (Two Books) by S.L Loney
• Problems in Calculus Of One Variable by I.A.Maron
• Hall and Knight Higher Algebra

In case you want to know about JEE Main 2019 – Preparation Tips, Important Topics & Books, Kindly go through following Link-

https://engineering.careers360.com/articles/jee-main-2019

To know more books for JEE Advance, Kindly go through following Links-

https://engineering.careers360.com/articles/jee-advanced-preparation-tips-physics-chemistry-and-mathematics

All the best.