Hi pal,
Bsc in aviation is 3 year ug program which provides education in science and operations in flying airplanes, helicopters, gliders etc. An integral factor for being eligible for this course is that the candidate must have completed 12thand passed HSC Examination with Physics,maths,chemiestry with a minimum of 50% marks, from a recognised school in India.
Most of colleges provides admission on the basis of 12th percentage.
B.Sc. AV is a course through which students find job opportunities in the aviation industry and aerospace firms. Within these, professionals can find job profiles like that of service maintenance engineer production, maintenance manager ,software testing engineer, and aircraft maintenance engineer.
For abroad you will have become master in that particular field then any international company will offer you job in abroad.

Good luck.