Science

The Aviation sector has been providing numerous job opportunities to graduates in India. In the past, in case of India, there weren't 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.
B.Sc. Aviation graduates have different career paths and opportunities available in front of them. Prominent job roles available in front of them (within the aviation industry) are
Pilot (must possess CPL)
Flight attendant
Air Traffic Controller
Aircraft maintenance professional
Cargo manager
Airport ground duty manager
In short, one may join any of the above mentioned sectors (within the aviation industry) after completing B.Sc. Aviation course. For becoming a pilot, one must successfully complete flying training though!

Marine engineering is a field that deals with the engineering aspect of the maritime industry. Like any conventional engineering course, marine engineering is a four year course which prepares an individual to become an engineer on ships.
Marine engineering is all about machinery on ships, boats, yachts, or any sea going vessels. There are several other technical streams that sprout out from this field. The curriculum of the course focuses on teaching specialized knowledge of both theoretical and practical marine and mechanical engineering. Greater importance is given to impart skills and competencies that are required to operate and maintain machinery on board ships.
The subjects taught in the first and second year of the course are almost the same as those taught in conventional mechanical engineering. The main aim is to introduce engineering sciences to the students and to make them understand the applications of those sciences in various aspects of marine engineering.
Nautical Science
While marine engineering makes an individual a ships engineer, nautical science prepares a person to become a deck officer. Nautical science is a three years course after which the student joins a ship as trainee cadet officer. After completing sufficient time at the sea and clearing required competency exams, promotion is given to the officer.
Nautical science imparts nautical technology knowledge which is important to become a deck officer on board ships. Theoretical and practical knowledge required for navigation, cargo operation, and ship maintenance and operation is imparted during the three years course, along with exposure to some areas of humanities and social sciences. Hands-on training is extremely important as a deck officer and thus detailed procedure and maintenance techniques of importance deck machinery is an integral part of this course.

M.Tech Mathematics and Computing offered by IITD is a special 5 years course which is different from Computer Science. The program aims at training the students to handle problems in industry and research laboratories through combined use of mathematical and computational techniques. The emphasis is on training them in various aspects of theoretical computer science, computational techniques, mathematical modeling, simulation, probabilistic and statistical tools.
This course is run by Faculty of maths at IITD and has lot of mathematical emphasis. IT is an ideal course for become Data Scientist or Business Analyst which is facing worldwide shortage.

B.Sc biotechnology admission in most of the colleges is through entrance examination such as Jamia Millia Islamia in New Delhi. Some colleges may offer it by merit as well. Here is list of colleges offering this course:
1. Punjab University, Chandigarh www.puchd.ac.in
2. Jamia Milia Islamia, New Delhi www.jmi.ac.in
3. Rajiv Gandhi Institute of Information and Biotechnology, Bharati Vidyapeeth-Pune www.bharatividyapeeth.edu
4. Christ University, Bangalore www.christuniversity.in
5. JNU, center for Biotechnology, Delhi www.jnu.ac.in/sbt
6. IIT (Department of Biochemical Engineering) Kharagpur via JEE entrance
7. Jamia Millia Islamia. http://jmi.ac.in/
8. Amity Institute of Biotechnology. http://www.amity.edu
9. Institute of Applied Medicine & Research. http://www.iamrgzb.com
10. The Mangalmay University. http://mangalmay.org
B.Tech biotech in DTU is a 4-year course and the direct admission is by JAC entrance exam or if you are diploma holder then eligible for lateral entry by entrance exam. The candidates seeking admission to B.Tech lateral entry programmes.
Must have cleared a State Diploma Examination of three years duration in any branch or any other examination equivalent, recognized by the Delhi Technological University with a minimum aggregate (aggregate of all six semesters / three years) of 60% (50% for SC/ST and 55% for OBC candidates.