Science

The eligibility criteria for ISRO is mentioned below:
Educational qualification:
1) First class marks in BE/B.Tech or equivalent exam with a minimum of 65% (combining all semester) or CGPA 6.84.
2) Candidates appearing for the final year BE/B.Tech course in the academic year 2016-17 are eligible to apply subject to release of final result and degree by 31.08.2018.
3) Nationality: Indian
Age limit is 18 to 35 years.
Note: These are only the minimum requirements and clearing these does not make you automatically eligible for the written test.

If you have backlogs in your current course, lateral entry into another university will become difficult. Please check with the admissions department of your institute.

You should pursue a course where your interests lie. Please refer to the link mentioned below for a detailed comparison between the two:
https://ask.shiksha.com/what-is-the-difference-between-b-sc-agricultural-biotechnology-and-b-sc-general-biotechnology-qna-3056566

To pursue MS from a foreign university, you would first need to clear your backlogs, unless mentioned otherwise. Your work experience and scores in GRE are fine.

There are a number of students opting for B.Sc (agriculture) these days, but colleges are few in number and competition is growing each year. General category students need a minimum 7000 rank in EAMCET to secure a seat in B.Sc in agriculture.

The career in fashion design is a long term project in one's life and it is one of the best paying industries. Some of the jobs you could explore in fashion design field are as follows:
1) Fashion Designer
2) Fashion Illustrator
3) Fashion Stylist
If your strengths lie in illustration, you should pursue a career as a fashion illustrator.

The eligibility criteria for M.Sc is a minimum of 55% marks in B.Sc and a good rank in the qualifying examination.

That depends on the university you are applying to. Few universities have minimum 60% as the cut-off while others have 50% as the cut-off. For eg: DU has 60% as the cut-off, whereas, Manipal has the 50% as the cut-off.