Science

There is the great scope after B.Sc in botany. After the completion of your Bachelor of Science in Botany, you can work in different sectors such as Nursery Farms, Lecturer at a College or University, Environmental Consultancies, Pharmaceutical Company and Medical Content Writing.

Top B.Sc. {Hons. }. Colleges in India - List of B.Sc. {Hons. }. Colleges
Manav Rachna International Institute of Research and Studies, [MRIIRS] Faridabad. Miranda House, Delhi University. Lovely Professional University, [LPU] Jalandhar. Hindu College, Delhi University.

Sri Venkateswara College, Delhi. Delhi, Delhi NCR. All India Institute of Medical Sciences AIIMS Delhi. Delhi, Delhi NCR. Lady Shri Ram College for Women, Delhi. Delhi, Delhi NCR. St Stephen's College, Delhi. Delhi, Delhi NCR. Hindu College, Delhi. Miranda House, Delhi. Hansraj College, Delhi. Jesus

The P.B. B.Sc Nursing programme at SCN is two years of duration course with intake of 60 students.
The course fee is about Rs 85000 per year(Excluding Hostel and Mess charges).

You can apply for Science courses after commerce, but they will need a lot of hard work as every Science course requires basics of PCM/PCB. So you may apply but according to me you should take one more year with Science field subjects and give your 12th class exams again so as to get good jobs.

Please refer to the link mentioned below where you can compare different colleges of your choice for a course in M.Sc. (Biotechnology) in Jaipur:
https://www.shiksha.com/science/colleges/biotechnology-colleges-Jaipur