I don't have any ideas , I don't know about jee formalities, I want be prepare for jee , so what I do

JEE Application form will be out in the first week of December.
In order to take admission in NITs and IIITs make sure you get 75% in your boards exam or you should be in top 20 percentile in general category and 65% marks in SC and ST.

Before starting your preparation make sure you are aware of full syllabus, exam pattern, Important topics. In order to score good marks in JEE Main make sure your basics are clear. You can take help of NCERT books for your preparation. So, that you can build strong concepts and fundamentals.

You can refer previous year papers to understand the exam pattern and level of questions. Focus on important topics. You can solve as many as MCQs for your practice.

Solve complete mock test series to work on your time management and to judge your preparation level and to know your weak and strong areas. So, you can work upon them.

Below are the important topics for JEE Main Preparation which will help you to fetch good marks-

Physics
Modern Physics Number of Question-4 Marks-16 weight age- 13.33%
Current Electricity Number of Question-3 Marks-12 weight age- 10%
Capacitor Number of Question-2 Marks-8 weight age- 6.67%
KTG & Thermodynamics Number of Question-2 Marks-8 weight age- 6.67%
Work, Power and Energy Number of Question-2 Marks-8 weight age- 6.67%

Chemistry
Halogen Derivative Number of Question-3 Marks-12 weight age- 10%
Chemical Bonding Number of Question-2 Marks-8 weight age- 6.67%
Complete P block Number of Question-2 Marks-8 weight age- 6.67%
Mole Concept Number of Question-2 Marks-8 weight age- 6.67%

Mathematics
Sequence & Series Number of Question-2 Marks-8 weight age- 6.67%
3-D Number of Question-2 Marks-8 weight age- 6.67%
Tangent & Normal Number of Question-2 Marks-8 weight age- 6.67%

Below are the recommended reference books other then NCERT

Physics -You can go for H.C Verma and Resnick Halliday

Chemistry - You can go for OP Tandon, Finar

Mathematics - You can go for RD Sharma and K.C Joshi

All the Best for your Preparation!!