JEE main qualify karne ke lia kiss book ka practice kiya jata hai.jisase Delhi technology university mil jaye??

DTU provides admission on the basis of Jee main only and to clear this exam you can refer below provided books -

Physics Concepts of Physics Vol I and II by H.C. Verma Problems in General Physics by I.E. Irodov Fundamentals of Physics by Halliday, Resnick & Walker.

Chemistry Numerical Chemistry by P. Bahadur Organic Chemistry by Paula Bruice Yurkanis Inorganic Chemistry by J.D. Lee Organic Chemistry by Morrison & Boyd

Mathematics Maths XI & XII by NCERT Trigonometry by S. L. Loney Co-ordinate Geometry by S. L. Loney Higher Algebra by Hall & Knight Problems in Calculus of One Variable by I.A. Maron.

Apart from this, you can go through the below provided link to know the detailed preparation tips -

How to prepare for Jee main 2018?

Hope this helps!!!

Hi I would recommend you to first study your class XI & XII Physics, Chemistry and Mathematics NCERT books thoroughly and when confident enough, move to the following reference books: Physics: Concepts of Physics by H. C Verma Vol 1 and Vol 2 Problems in General Physics by I.E. Irodov Elements of Dynamics by S.L.Loney Arihant Physics by D. C. Pandey Advanced level Physics by Nelson and Parker Fundamentals of Physics Resnick, Halliday, Walker Chemistry: Atkins' Physical Chemistry Physical Chemistry by N Awasthi Organic Chemistry by Paula Bruice Yurkanis Organic Chemistry by M.S. Chuahan Inorganic Chemistry by J.D.Lee Inorganic Chemistry by O.P.Tandon Mathematics: Higher Algebra by Hall Knight+ Bernard-child Differential Calculus by Arihant Integral Calculus by Arihant Problems in Calculus of One Variable Algebra by I.A.Maron Class XI & XII by R.D. Sharma Higher Algebra by Hall Knight+ Bernard-child Prepare well to be able to make it IITs. All the best!