Science

The college don't offer any such course.

I'm sorry to say but the cut-off for mathematics (H) is quite high. You won't be able to get admission in Hansraj College.

No. Cut-off of Hansraj College for B.Com honors is very high. You being the science student will also undergo percentage deduction, so won't be able to get admission.

Sorry, but you won't get admission with this percentage.

Yes, you can join navy by taking Combined Defence Service, this itself provides all the training of arms and ammunition to the cadets. Enroll yourself in CDS and work hard.

B.Sc B.Ed also known as B.Sc+B.Ed is an integrated course which includes subjects like:-
Chemistry
Botany
English
Mathematics
Physics
Zoology
And it is also have teaching and field work.

Yes, microbiology is a good career option only if you have interest and proper knowledge. In India, doing this course probably is not a great idea, because here Microbiology is still a developing subject. But in other countries like U. S it is a great option and also they have handsome package there

The fees structure vary from college to college depending upon whether the college is government or private. Fees structure for government colleges is less than private colleges. Fees per semester for B.Sc. Biotechnology course is around 40000 or more in private colleges and around 20000 in governme

The admission is going on these days in the university.
Details about B.Sc are here:
https://www.mmumullana.org/custom/graduate-courses-bsc-medical-non-medical