Science

No, you can't fit into IISER.

Please check for your eligibility to apply for admission to B.Sc. in Agriculture from M S Swaminathan School of Agriculture, Centurion University of Technology and Management, Paralakhemundi from the criteria mentioned at the link provided below:
https://www.shiksha.com/science/course/b-sc-in-agricul

Hi Priti,
You cannot enroll in three different degree programme simultaneously. It is not even recommendable. Thanks.

Hi,
No such specification is mandate on the university webpage. Interested candidates can apply online/offline with required information.
You can still get in touch with the college official for detailed information.
Regards

Of course, yes. But any three sections having the highest marks along with the marks of the general section will be considered for evaluation.

Yes, for boys, it is left and for girls, it is the right one.

For physics Honrs, you need to get approximately 90% and above. It would be quite difficult to get into DU as the percentage is low.