JEE Advanced

By going with the rank vs mark list or previous years JEE Advanced, your JEE Advanced rank will be around 15-20k.

You will need to have more than 60% to stand any chance for getting into IIT, Madras.
All the best.

There are other colleges, considering the cases like IIT ranks around 10000 and above you can attempt for two major Chemical and petroleum degrees from IIPE, (mentor by IIT KGP) Which is the 3rd year of the college. RGIPT, Raebareli, which provides degree in Petroleum but, there are likely to close around INR 15 k to INR 18k as well. There might be new addition, in some university seat or Scholarship based on JEE Advanced Rank. Read Advanced Brochure.
There are a few International colleges in Singapore that consider Advance Rank along with IISc Bangalore for it's Bachelor's Programs.

You can predict your college according to score and rank.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
You probably get a seat in any IIT. But, you will easily get seat in NIT or IIIT. Go through above link.
All the best.
Thank You.

Andhra Pradesh-EAMCET 2018 College Predictor:
Use your Andhra Pradesh-EAMCET 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack.
The result is based on admissions data of Andhra Pradesh-EAMCET 2017:
Get resources and insights on colleges & courses:
https://www.shiksha.com/b-tech/resources/ap-eamcet-college-predictor

Hello dear,
I am attaching a link of JEE College Predictor where you can find the best college you can get through your rank in JEE:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=7489993

When the results will be out for the JEE Advanced, the college predictor will be available.

Hello Yogesh, I am afraid 120 marks in JEE Advanced are rather low for getting admission in an IIT.

First of all, congratulations for your excellent result.
Your rank will be near 25000. You probably cannot get seat in IIT, but off course you have good option for NIT College. You can see the list of NIT and IIIT College which you can get:
https://www.shiksha.com/b-tech/resources/jee-advanced-rank-predictor
Best of luck
Thank you.

To qualify for giving JEE Advanced exam, you need to have 75% marks aggregate in class 12th, then only you will be eligible for appearing in the exam. Thank you.