India

Dear Aman,
Please go through these link to predict the college that you can get.
Rank predictor : https://www.resonance.ac.in/answer-key-solutions/JEE-Main/2017/jee-main-2017-rank-predictor.php
College predictor : https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Dear Kapil Rao,
Prefer University of Petroleum-Dehradun, which is getting solid companies for campus recruitment and receiving the highest placements so far.
All the best.

Dear,
Find out if there is a TIME, IMS, Career Launcher, etc. coaching centres as these are the best coaching centres in India.

Getting into IIT take a lot of hardship and dedication. For an SC candidate, I think securing 40% marks are sufficient to get into IIT (but it depends on which IIT do you want to go for and also the branch you choose matters). The other thing that affects the result is the difficulty of the question

Dear Sariputi,
Please go through these link to predict the colleges that you can get.
Rank predictor : https://www.resonance.ac.in/answer-key-solutions/JEE-Main/2017/jee-main-2017-rank-predictor.php
College predictor : https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Try this link:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

You may refer to following link for list of top Aeronautical Engineering colleges in state of Tamil Nadu: https://www.shiksha.com/b-tech/ranking/top-aeronautical-engineering-colleges-in-tamil-nadu/49-2-123-0-0