B.Sc

The general eligibility criteria is 10+2 passed from a recognised board with PCM subjects or passed valid (and relevant) 3 years long Diploma course from a recognised institute.
But it has been noticed that eligibility criteria may vary from one institute to another. But reputed institutes stick to the criteria that has been mentioned above.
Reputed institutes rely on merit based admission process. Marks scored by students in 10+2 board exam and/or relevant entrance test is taken into consideration. Based on the marks scores, a merit list is formed.
Depending upon the cut-off marks, seats are allotted to deserving candidates. Some institutes are also known to conduct their own selection/entrance test.

The Aviation sector has been providing numerous job opportunities to graduates in India. In the past, in case of India, there werent many courses that focused on the aviation sector and groomed students to take on roles in that sector. Usually, Graduates of any discipline used to apply for aviation jobs. They used to get trained after they were selected after an interview. At present, things have changed! There are many aviation sector oriented courses present, which cater to the needs of the aviation Industry!
Note that career prospects and the possibility of landing a high paying job in Aviation sector depends a lot on the quality of the Institute from which you pursue the course. Yes, type of course and aptitude of the candidate also plays a huge role. Make sure that you research well about an Institute/College, before taking admission in it. The first thing you should check is whether the Institute you are interested is approved and recognised by the appropriate authorities or not! Before selecting a particular course, make sure that you have the aptitude and ability to thrive in the role associated with that course. For example- not everyone can become a Commercial Pilot! If you don't have the aptitude to become a Pilot, it would be better to choose another Aviation course!