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Dear Madhu,
Keeping in mind this year JEE (Main) paper analysis, last year cut offs and only your JEE Main marks (boards not included), you may expect the below colleges
National Institute of Technology, Tiruchirappalli
Pandit Dwarka Prasad Mishra Indian Institute of Information Technology Design & Manufacture, Jabalpur
National Institute of Technology, Durgapur
Dr. B. R. Ambedkar National Institute of Technology, Jalandhar
National Institute of Technology, Jamshedpur
National Institute of Technology, Srinagar
National Institute of Technology, Warangal
National Institute of Technology, Rourkela
National Institute of Technology, Imphal
Indian Institute of Information Technology, Amethi Campus
Atal Bihari Vajpayee Indian Institute of Information Technology & Management, Gwalior
National Institute of Technology, Karaikal
J.K. Institute of Applied Physics & Technology, Allahabad
(The above is as per last years closing ranks and may vary this year)
For the list of institutes, you can refer to shiksha college predictor
https://www.shiksha.com/jee-mains-college-predictor
To calculate your JEE Main rank, you can refer to the below articles
https://www.shiksha.com/jee-main-2014-rank-predictor-how-to-calculate-ranks-and-scores-article-7711-1
https://www.shiksha.com/jee-main-2014-rank-predictor-understanding-percentile-and-normalization-of-class-12th-board-marks-article-7710-1
https://www.shiksha.com/jee-main-2014-rank-predictor-how-to-map-scores-to-ranks-article-7713-1
All The Best

Dear Shankar,
Biotechnology engineering is the study of biology with technology for research & development. The scope of this branch has been on the high in the following fields:
Gene therapy
Tissue culture
Immunotechnologies
Genetic Engineering
Plant-based drugs
Rational drug design
Stem cell techniques
New DNA technologies
Photosynthetic efficiency
Enzyme engineering and technology
Thus you can opt for a course in the above specializations.
A Biotechnologist can seek a career in food processing and agro based industries, chemical and textile industries, agricultural sectors, pharmaceutical firms and manufacturing industries, research laboratories, which are run by government or private sector. Professionals can seek job opportunities in private sectors such as , pharmaceutical farms and aquaculture.
Hope this helps.
Thanks
All The Best.!