IIT Preparation

Dropping a year after your class 12th for JEE preparation is a big step.
Results completely depend on the choices and steps taken by you during preparation.
It doesn't affect at all in any way for future whether you crack JEE or not.

You should do whatever you are passionate about, if you are interested in doing chemical engineering then go for it.

To be very honest, life doesn't end without getting into an IIT. So if you want your brother to start a fresh with B.Tech. In IIT I'd say, it's really not a good option. Answering the question, first of all IITs do not entertain mid program joining so he'll have to start fresh. Second, if he really wants to enter IIT whatsoever then he should prepare for the JEE Mains and Advanced, get a rank and Kudos. He is in IIT. But he still has to fight, life is no simpler in IIT and the struggle is real.

Hello Harshal,
Just don't worry. You have made a very good choice. Maybe you can think of appearing for MHT CET also.

Hello Shekhar
Don't worry, it is good that you have found your interest and if you don't have an interest in IIT then no problem. Next year, at the time of admission, you should try to take admission in a design course.

If you are in 11th standard, this is the best time for you to start preparation.
You should take care of these points:
1. Join a coaching if needed.
2. Don't collect to much study material.
3. Find a mentor.
Best of luck.

You can prefer books like RD Sharma for maths and Arihant previous year papers.
Chemistry - error less and NCERT is the best book.
Physics- DC Pandey and join Aakash I-Tutor.
All the best.

Eligibilty criteria to appear in JEE is that candidates must have passed their Class 12th Exam or any equivalent qualifying examination or those who are appearing in their Class 12th Exam or any equivalent qualifyingv examination are eligible to appear in JEE(Main)- 2017. Eligibilty criteria does prohibits students from open schools to appear in JEE Mains and JEE Advanced.

Well try knowing concepts properly and have a good time management and give exams stress-free. Let me know which coaching you have joined and in which city.
Please upvote if you found this answer useful.