JEE Preparation

Yes, it is very much possible to clear the IIT examination without doing a coaching in one year. You just have to focus on the course and clear the concept. And give regular practise examination. Continuous practise and hardwork will eventually make your way to IITs.
All the best.

No, only NCERT books are not sufficient. You need to study much and more book than that. Some of standard book you need to study and solve them. More the practice, more you will be able to answer in the exam. Search for best books for JEE Advanced study.
Best of luck for future.

Hello,
Hope you are doing well. I suggest you not to drop for an year because you have less marks in JEE and you will again start form scratch to get an IIT. Drop will waste your 1 year and the competition will be higher in upcoming years. Go for some good private college with your favourite branch and do well there. All the best.

Hello,
I hope you are doing well. If you qualified and cleared the cut-off of JEE Mains in your category, then you should not take the drop because this will waste your time and you will suppose to start from scratch. Try to go for counselling and apply for government college, if you will not able to get the government college then go for some good private college but I suggest you not to drop until and unless you lose an opportunity by few marks to get an IIT.
All the best.

Coaching does nothing, it is only for the problems that you come across and can't be able to solve it by your own. Self-study is the best study and no one can beat that the only thing required for the JEE is smart work rather than hard work and for that only coaching institutes charge so much of fees.

Solve previous years question, but without using answers keys. If you crack all of them, then your concept is good.

https://www.google.com/amp/s/www.shiksha.com/b-tech/articles/amp/jee-main-and-advanced-2016-prep-important-books-topics-blogId-11621
This link will help you to the best.

If you realize where actually you made mistakes and your peer mates won then you can prepare it at your home. Moreover, if you haven't studied seriously, it is necessary for you to take a good coaching institute with your determination which can actually drive your nerves to your goal. Moreover, in case first also, coaching is preferred as your home is unable to give you that atmosphere. Best of your luck.

No doubt that the VIT is the best college it has good incubation center and many research laboratories but the main problem over there is the fees problem that everybody can't afford.

Hello, hope you are doing well. You must go for VIT, Vellore instead of wasting a year in JEE preparation because Vellore is very good college instead of getting colleges with JEE marks. All the best.