Hi Manish,

Yes, but along with Coaching Material you Must Practice the Previous Question Papers and Some Books which helps you Score better

These are the Books to Prepare for JEE

Maths: 11th and 12th by NCERT 

           trigonometry by L.LONEY

           Co-ordinate Geometry by S.L.LONEY

           Algebra by HALL & KNIGHT

           Problems in the calculus of one variable by I.A MARON

Physics: Vol 1 & 2 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

Note: There's a  Book Called Lilliput which has formulas and definitions of each concept in it, That was Really Helpful for me while I was Preparing for JEE and EAMCET Exams.

Hope it helps.

Hello dear, 

Yes, coaching material can be very useful for preparation of jee mains if it is from Some reputed coaching centre and if its  content is good then it will benefit you a lot but try to go through some books also like ncert ,H. C verma, etc. 

We can't say this statement because might be possible this but not always and it also depends on which coaching material are you talking about, if you talk about resonance and Allen material its good but you have focused on clearing your concept and put your all efforts and hard work toward your study.

All the best dear