which type books should o read? objective or subjective for JEE mains ..

In order to get good marks in JEE Main make sure your basics are clear you can take help of NCERT books for that.
After, completing your NCERT you can recommended below books for your preparation

Physics
Concepts of Physics by H. C. Verma
Fundamentals of Physics by Halliday, Resnick and Walker
Problems in General Physics by I. E. Irodov
University Physics by Freedman and Young

Mathematics
Higher Algebra by Hall and Knight for Algebra
Coordinate Geometry by S.L. Loney
Differential and Integral Calculus by N. Piskunov
Calculus and Analytic Geometry by Thomas and Finney for Calculus
IIT Mathematics by M.L. Khanna
Course in Mathematics for IIT-JEE by Tata McGraw Hill publications
Problems Plus in IIT Mathematics by A Das Gupta
Trigonometry by S L Loney

Chemistry

University Chemistry by Freedman and Young for Physical Chemistry
Organic Chemistry by Morrison and Boyd for Organic Chemistry
Organic Chemistry by Solomons and Fryhle for Organic Chemistry
Concise Inorganic Chemistry by J. D. Lee for Inorganic Chemistry
Modern Approach to Chemical Calculations by RC Mukherjee

All the Best!!

Ncert is best book for jee