IIT

If you need to take admission in IIT, you need to qualify for JEE Mains paper 1.

It is just great that you have thought to study B.Arch at IIT.
You should appear for JEE main paper 2 (B.Arch).
Almost all the coaching centers are good. I don't want to mention any coaching center names. If you want to get into any best institute then refer those which produced the toppers in JEE ex

Hello vivek,
As per your choice and category, something closer to 150 marks in JEE Advance will land you to the IITs.
All the best.

If you clear JEE mains and are eligible for JEE advance then you have chances to get a government college like NIT.

Don’t worry, you still stand a chance as cut off for OBC is 49.
Use the links mentioned below:
https://www.resonance.ac.in/answer-key-solutions/JEE-Main/2017/jee-main-2017-rank-predictor.php
https://www.resonance.ac.in/reso/news/JEE-Main-Branch-Predictor.aspx

Dear,
To get admitted in NITs or IITs, you need to score at least 75% marks.

Hello,
You may check about the college by filling up your rank and other detail in the link below:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Go through NCERT.
Solve more and more questions.
Try to solve previous year questions and question banks also.
IIT is undoubtedly the best college for engineering in India.

You won't get admission in IITs until and unless you qualify JEE Advanced.