First of all, 9th class is the best class to start your preparations.
In class 9th, you should focus on Olympiads etc so that you build up your level above CBSE. For this you will need a very good guide. Now for JEE, follow this:
The Complete JEE Guide:
1. Be sincere in your efforts (Half hearted hard work doesn’t give fruitful results !)
2. Practice from limited and standard books like HC VERMA, etc. Dont do too many books. Do limited books, and do it more number of times. Become perfect in them.
3. Get a good Guru, if you can find ! Guru is the person who knows what should be done and what should not be done. He/she is the best guide.
4.Focus more on previous year questions of IIT JEE
Physics:Start with HC Verma. Then go ahead with IIT JEE Questions directly. Dont go for any other crap books.Also other books from Arihant and GRB are good .. However if u have time left after doing previous years, you can solve Irodov, Resnick, Krotov etc !
Chemistry:NCERT most important. Other than that, for reference, use OP Tandon, MS Chouhan, Pradeeps, Morrison and Boyd, Himanshu Pandey, P Bahadur, SN Sanyal etc. Other books from GRB and Arihant are also good !
Maths:Start with NCERT, RD. Then go ahead with A Das Gupta, MCQ in Maths, Advanced Problems in JEE (Balaji) and then previous year questions from Arihant 39 years !etc More books of Arihant and GRB can be used if needed.
Practice previous year IIT JEE questions MANY TIMES (You can use Arihant 39 years for that ! ) . Become perfect in them. Solve other people’s doubts. These will help you score better :). People run after so many modules and crap test series. Instead you should focus on limited material and do it more number of times !! Many questions ask only basic concepts but a good clarity in them. Self study is definitely most important. But coaching really helps you score more
Mantra: Arise awake and stop not till the goal is reached :) ~Swami Vivekananda