Acquire study material and guidance:
It is important to get a hold of the requisite study material and books beforehand. Even if you are not willing to take up a course at coaching institute then at least draw help from mentors who expertise in preparing students for JEE 2017. Another great option is to enroll for an online course. Apart from this, NCERT, the online prep platforms offer the best material, question banks, test series, etc. to base and improve preparation on.
Important books to refer-
Physics: Concepts of Physics by H.C.Verma(Volume I & II), Arihant , Resnich Halliday (Volume I & II), O.P Tondon
Chemistry: NCERT, R.C.Mukharjee, Arihant, NumericalChemistry "? P Bahadur, Physical Chemistry "? O.P Tondon
Mathematics: New pattern IIT-JEE, Cengage, Trignometry, Coordinate Geometry "? SL Loney, Algebra "? Hall and Knight, Calculus "? Thomas and Finney
Revision and practise:
JEE 2017 is all about concepts and understanding. Abstain from learning by rote as it will not take you anywhere. Focus on concepts and practise enough form books, online and sample papers. Refer to previous years' papers to know the pattern and difficulty level of questions asked.