Hello Ashwin. You mentioned your CRL-AIR in the question, so I assume you belong to General category. You also mentioned you are interested in pursuing either Computer Science and Engineering or Electronics and Communications Engineering and Mechanical Engineering. Well, based on your performance in JEE Main 2021, you low chances to get admission at any top-rated branch of NITs, IIITs or GFTIs. However, if you are lucky enough, you have slight possibility to get chance to grab a seat at newer branches of NIT in terminal Rounds of Counselling processes (if the seats are available) like:

• NIT Mizoram (CSE, ME,ECE)
• NIT Agartala (ME)
• NIT Srinagar (ME)
• NIT Andhra Pradesh (ME)
• NIT Puducherry (ME)
• NIT Nagaland (ME)

Apart from these, you can opt for any the colleges mentioned below as you have good chances in these various Private engineering institutes for pursuing CSE or ECE or ME such as:

1. Birla Institute of Technology, Mesra
2. Thapar Institute of Engineering and Technology
3. Shri G. S. Institute of Technology and Science
4. Jabalpur Engineering College
5. Delhi Technical Campus, Greater Noida
6. GNIOT Group of Institutions, Greater Noida
7. B.M. Institute of Engineering and Technology, Sonepat
8. Mahavir Swami Institute of Technology, Sonepat
9. Bharati Vidyapeeth College of Engineering, Delhi
10. JIIT - Jaypee Institute of Information Technology

I have also listed the JEE-Main 2021 cutoffs required to be marked as qualified for JEE-Advance 2021 below :

• Common Rank List (CRL) - 87.8992241-100.0000000 Percentile
• GEN-EWS - 66.2214845-87.8950071 Percentile
• Other Backward Classes (OBC-NCL) - 68.0234447-87.8950071 Percentile
• Scheduled Caste (SC) - 46.8825338-87.8950071 Percentile
• Scheduled Tribe (ST) - 34.6728999 87.8474721 Percentile
• PwD - 0.0096375-87.8273359 Percentile

You can also check out more details about JEE Main 2021 cutoffs from the link of the article given below:

https://engineering.careers360.com/articles/jee-main-cutoff

To get a detailed personalized report on your eligibility in various colleges based on your performance in JEE Main, I encourage you to use JEE Main 2021 College Predictor:

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

I hope this information is enough to answer your query. I wish you all the best for your future and career.

Thank you.