JEE Main

Yes, it is a good branch. But opt for metallurgy only if you are interested in this field.

You can check your college.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

I think so, if you want to devote one more year for JEE, then only. If you have a strong will power, then only try for it. Otherwise, it will waste your prestigious 2 years and you will have a regret of lifetime. Please let me know how are your studies going on? Are you not able to study well or unable to concentrate? Have you registered for any coaching institute droppers batch. Then, I may help you in letting know of how to get you through the exams and out of wits.

Hi buddy,
You can use this link to find out opening and closing ranks of IIIT Delhi:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=6375912
Hope this helps. All the best.

NCERT books are the best to prepare for such competitive exams. Prepare your 11th & 12th syllabus thoroughly from your books. You can solve the previous years' question papers and sample papers also.

In 2017, the cutoff of NIT is around 20k.

Yes, it is still a matter of discussion, as CBSE gives a clue about this idea. I think this idea will not be succeed as number of candidate will be larger and too much money will be spent on it. After all nothing can be said. Be prepared.

Crossing 100+ in JEE with one year drop is no matter, you should aim for scoring 250+, which will be useful to you and in drop year your determination is only thing which can help you. Study for 8-10 hours without any distractions.

Nit colleges can be regarded as best choice but only some colleges offer pure sciences so refer to cut off ranks and decide which is better.you can also choose some universities which consider jee main rank