Science

Hi Nilima
Please visit link: https://www.shiksha.com/college/vidyasagar-college-ug-campus-amherst-street-kolkata-49407/course-b-sc-hons-in-botany-266365
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B.Sc. In Genetics colleges in India
Kristu Jayanti College. MS Ramaiah College of Arts, Science and Commerce. AIMS Institutes. The Oxford College of Science. SOGS, Jain (Deemed-to-be University)
Loyola Academy Degree and PG College. Guru Nanak Institute of Pharmaceutical Science and Technology. Reva University.

You can consider following colleges:
Jai Hind College
Amity University
St Xavier's College
Vidyalankar School of Information Technology
Please visit link: https://www.shiksha.com/it-software/colleges/b-sc-colleges-Mumbai-all
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Of course yes. You can take admission in BCA even if you don't have CS in class 12th. It is not compulsory to have math or CS in class 12th to take admission in BCA although some colleges are there that requires math in class 12th to take admission in.

Diploma in Electronics and Telecommunication Distance Education Admission 2022-23: Diploma in Electronics and Communication Engineering course duration is 3-years, and the course is divided into 6-semesters.

Yes, one can change college in second year from any college to other top college under Delhi University.

Fee structure at Pushpanjali College of Nursing for B.Sc. in Nursing. Please visit link https://www.shiksha.com/college/pushpanjali-college-of-nursing-agra-90721/courses
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Getting admission in NITs require general rank below 30000. It would be safe if you get that. You may get NITs till 40000 somehow. So coming for EWS quota there will be 10% increment in seats.

This college is private with fee structure of 1.16 lpa.