IIT Eligibility

Yes, sure. The eligibility criteria is a minimum of 75% (overall) in class 12th with PCM as a mandatory subject. Make sure you work hard so that you could qualify with very high marks in your respective category, so you will able to get a good college via JEE mains in one attempt.
Best of luck.

Being an SC candidate, you need atleast 65% aggregate marks. It is 75% for general candidate.

Hi Vishnu,
You can use this link to find out your answer. Hope this will help:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=6375912.

For shortlisting colleges, you can use previous years trends. For that you can use the below link. Submit your details and know chances of getting into some campuses:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=4479470.

Try JEE college predictor to Predict engineering College you can get on the basis of your JEE rank. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=4067795.

Your rank should be under 1000 in the JEE Advance exam or your marks should above 270 in JEE Advanced.

NCERT books are best for JEE preparations.

Hello Awdhesh,
Yes, you can get a college via JEE counseling. But you may or may not get a top college or the course you wish to get. It is difficult to say your rank as it depends on the number of candidates and their scores.
All the best!

It's tough to get an NIT with just 49 marks. Well, keeping the difficulty of JEE 2018 in mind, maybe, you can make it into an NIT but branch may not be good.