IIT

There are various coaching institutes in Bihar for preparation such as Vidhya Mandir, Super 30, Vision Classes and Resonance.

JEE Mains rank predictor is an online tool which predicts the candidate's rank range and probable colleges based on the difficulty level of the examination, average marks scored in JEE Mains and seats available in IITs, NITs, GFTIs, and other SFTIs. The rank predicted might not be accurate but it certainly does give an idea to the aspirant. Know your college admission chances based on your JEE Mains Rank, Home State, Caste, Gender, etc.
Here is the link:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

To get into IIT, there is only one way and that is JEE Mains and Advanced. You cannot get it via NEET.

Here is a list of colleges accepting JEE Advanced. https://www.shiksha.com/b-tech/colleges/b-tech-colleges-accepting-jee-advanced-india.

Hello, As per your JEE Mains percentile you have 334 marks and if we can give a try so you might have ranked below 5000 and yes there will be chances that you will get either NIT or IIIT but for IIT admission you must have scored well in JEE Advanced.

It's on you totally if you think you can work hard in the drop year than go for drop otherwise get admission in SGSITS and prepare for higher studies from IIT. SGSITS even offer great on-campus placement record.

Yes, you are eligible for this.

IIT is an Institute to pursue UG or PG programmes upon eligibility. IAS is qualification to do civil service. So, if you want to a part of an Industry or an entrepreneur, go with IIT. Else you can go with IAS.

This year paper is little tough and lengthy as compared to last year so I think cutoff will probably go down. According to me for
General category 115-125Obc. 110-115ST. 60-65
SC. 40-50
For a general aspirants to get a seat in good IIT with good branch, rank should be under 6500. JEE advance marks are also valid for many other institutes also.