Science

No one is best all are sheer waste. Graduation will not help you caracking the one of the most the toughest Examinations in the world. What is the most important is your aptitude knowledge and your efforts towards achieving the goal. Choose any of this and try your best.

B.Sc. in maths, physics, and chemistry. You can opt for commerce courses as well.

In management quota, rank is not needed for admission.

Yes, you can definitely do Masters in Environmental Science after completing your Aviation degree. Best of luck for your future and if there's any query, feel free to ask.

Give the entrance, get a rank then go to counseling and choose college and trade get admission finally.

There is semester system.

Please check for your eligibility to appear for the NEST exam from the criteria mentioned below:
NEST 2018 Eligibility
Candidates fulfilling the below-mentioned requirements meet NEST 2018 eligibility criteria:Candidates should pass Class XII in Science stream from a recognised board in India with at

Hi Lakshmi,
The eligibility criteria for nearly all universities in India is a 12th or equivalent pass with minimum 50%.
Whether you do it in Arts, Science, Commerce or Vocational, it hardly rarely matters.
Hope I was able to solve your doubt.

B.Sc in which field? There are many fields in B.Sc. On an average one need to score 50% marks in the entrance at least. As I have said earlier in another thread, there can be no prediction in case of cut off marks because every year diverse set of people come to give entrance test.