Science

You can refer to the link: https://goo.gl/JO4Ez4

You need to score at least 50% to clear it.

The eligibility criteria for 3 year B.Sc Environmental Science is a pass in 10+2 examination or equivalent with Physics, Chemistry and Biology. Engineering diploma holders can also join the course. Andhra University; Gandhi Institute of Technology and Management (GITAM), Visakhapatnam and University of Madras, Chennai etc. offers Bachelor of Environmental Management (BEM) course. Eligibility criteria and duration of this course is as same as that of B.Sc course.

Hi,
Please check this link: https://goo.gl/B8QYUr

I, fortunately, you can enter IITs or NITs unless you crack JEE. For cracking JEE you require expertise in all three subjects i.e. Physics, Chemistry and Maths. If you can unable to get admission in these institutions now, you may try again by appearing for JAM examination conducted by IITs to seek admission in M.Sc degree course .
JAM is an admission test to Master of Science and other post-graduate science programs at the Indian Institutes of Technology, Indian Institute of Science, and other institutes.

BA in architecture is the most common course.

If you are thinking about a high-paying salary, the major difference is that biotechnology is a broad field. In this course, you will study about a lot of different subsets of biotechnology, that are bioinformatics, plant biology, animal biology, biochemistry, genetics and heredity, etc.
Microbiology is (somewhat) a type of specialisation. If you do choose B.Sc Microbiology you are confined to a type of field only for your Master's degree, but don't take my word for it. As I said earlier, different universities have a different syllabus and teaching styles too.