Science

Dear,
Weakness in one branch & strength in other branches of a particular subject is not.
And for math it is true also. But the challenge is to convert your weakness into strength. Integration part of Calculus is not so difficult that you can't manage - and you need not to be hesitant for pursuing B.Tech.in CSE. As you know well, there are two major process for Integration-
1. Method of Substitution and
2. Integration by parts. In addition there are some standard Integrals, where role of memory play the vital role. For overcoming shortfalls you need optimum practice. I think you can manage it if you want sincerely.
Best of luck.

You would be eligible for most colleges as PCM are three main subjects which you need to study at 10+2 level. Please refer to the link provided below for a list of top colleges which offer courses in B.Sc. Biotechnology in India:
https://www.shiksha.com/science/colleges/biotechnology-colleges-india

Some of the best colleges offering B.Sc. in Agriculture are private colleges. Faculty of these colleges are quite experienced and know their subject. Please refer to the link provided below for a list of top private colleges which offer a course in B.Sc (agriculture):
https://www.shiksha.com/science/colleges/b-sc-agriculture-colleges-india

Some of the top colleges in the US for MS in Accounting are as follows:
1) Rady School Of Management
2) Golden Gate University
3) University Of Denver | Daniels College Of Business
4) West Virginia University - College Of Business And Economics
5) Bentley University Graduate School Of Business
6) Azusa Pacific University
7) Minnesota State University
8) Binghamton University

Please refer to the link provided below for a list of colleges which offer admission based on the results of ICAR. You should be able to check if you qualify for admission into a college of your choice:
https://www.shiksha.com/science/exams/icar-aieea

Please refer to the link provided below for a list of colleges offering a course in B.Sc (Medical Imaging Technology):
https://www.shiksha.com/medicine-health-sciences/paramedical/colleges/colleges-india?uaf[]=specialization&ts=15020154&rf=filters&sp[]=433

Please refer to the link provided below for details on getting admission in Chandigarh University in B.Sc. agriculture:
https://www.shiksha.com/science/course/b-sc-hons-in-agriculture-chandigarh-university-245052

After completing your B.Sc in Mathematics, you could pursue a course in M.Sc Astronomy from some of the top colleges in India. This would open up a number of avenues for you in this field. B.Sc. in Mathematics should help you as Mathematics is a major part of astronomy and space research. If needed, you could plan for a PhD in astronomy and become a teacher in this field.