JEE Main

Yes, you are perfectly eligible for getting into NIT's and other colleges which take JEE Mains as their entrance such as IIIT's, DTU etc.

CSE is the best option inside B.Tech. Moreover, Thapar University is a great institute with a good package and curriculum. Hence, go for it.

Hello Sri,Please use Shiksha college predictor.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Hello, I hope you are doing well. You can check the list of colleges including NITs and IIITs that you can get according to your marks and rank here. Use shiksha JEE college predictor:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=7489993.

Hello Narendra,
Please use Shiksha college Predictor
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

If you realize where actually you made mistakes and your peer mates won then you can prepare it at your home. Moreover, if you haven't studied seriously, it is necessary for you to take a good coaching institute with your determination which can actually drive your nerves to your goal. Moreover, in case first also, coaching is preferred as your home is unable to give you that atmosphere. Best of your luck.

Your rank is very good. According to your marks, you can get NIT Bhopal, NIT Jaipur easily. Good luck.

JEE Mains 2018 College Predictor
Use your JEE Mains 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 JEE Mains 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Hello dear, your marks are too low for getting any government colleges, but you may apply for private colleges. Your marks are decent for getting good private colleges. Apply for JOSSAA counseling.

Anna University doesn't offer aerospace engineering. So, try for other universities.