CBSE 10th

Eligibility:10+2 with 50% in Physics and Math. Minimum age Requirement: 18Medical Class I and Class II (Medical fitness should be in accordance to DGCA guidelines)
Steps to apply:
1. Now the very first step is to get Medical examination 2 done. Only after Medical exam 2 reports, one can apply for medical certificate 1. Just visit Directorate General of Civil Aviation, Government of India's website and they have a long list of doctors who are certified to issue that certificate.
2. Next step is to apply to the respective flying school and clear their entrance exams to get through one of these:
APFT. , Hyderabad
Academy of Carver Aviation, Baramati
Ahmedabad Aviation & Aeronautics Ltd. , Ahmedabad
Chimes Aviation, Sagar, (Madhya Pradesh) Madhya Pradesh- call in October
Government. Aviation Training Instt. , Orissa
Indira Gandhi Rashtriya Udan Academy, Raebareilly
Madhya Pradesh Flying Club, Indore
National Flying Training Institute, Gondia
Besides these few colleges which are the top ones, one can also look at the of other flying schools as listed by DGCAhttp://dgca.gov.in/licencing/fly. In the above mentioned Institutes students can complete CPL. However attaining CPL allows one to fly CESSNA (small planes). In order to fly Bigger Airplanes one needs to attain TYPE RATING certificate. The full-fledged course (CPL plus Type rating) can be done from Cadet Pilot programme (Indigo and JET Airways Cadet Programs at National Flying Training Institute, Gondia). Here is the list of Licenses that one will be trained on in the flying school/you can attain them without going to a flying school:
Student Pilot License (SPL): SPL is like learners license. One must have SPL prior to start flying training. Oral test is conducted by Chief Instructor at flying school or by DGCA representative. Eligibility: student should be of 16 years of age, should have cleared 10th standard and should be medically fit as per DGCA guidelines. Private Pilot License (PPL): Private Pilot License should be attained if an individual has to fly his/her own plane. In order to attain, one needs to go through ground training for 4 months and fly for 40 hours. Eligibility: The candidate should be at least 10th passed and minimum age should 17 years.

Dear Tulsi,
Eligibility varies from university to university. Also, these days universities are offer B.Tech in Biotech, which is better than B.Sc as it is a professional degree whereas B.Sc is just a general degree. Many good private universities like VIT, LPU, SRM, etc. are offering admissions in B.Tech. These private universities offer admission on the basis of tests like JEE and their own tests. Some offer you direct admission too on the basis of your marks in previous qualifying exam. All these are world-class universities with modern infrastructure and good placements. Few of them offer scholarships too. So, you can check the websites of these universities to know the course and fee details. Some best colleges for B.Sc Biotechnology:
B.Sc Biotechnology
Fergusson College (Pune)
Christ University (Bangalore)
Presidency University (Kolkata)
Manipal University (Karnataka)
Loyola College (Chennai)
Mount Camel College (Bangalore)
Madrass Christian College (Chennai)
Jamia Milia Islamia (New Delhi).

Yes, you can do Diploma in engineering after class 10th. Most of the colleges offers 3 years Diploma courses in Engineering and after that u can go for B.Tech also as lateral entry in same college or other too. Also, after class 12th You can appear for various entrance examinations like JEE, and other entrance examinations conducted by state universities and other private universities. If you qualify in those entrance examinations, then you can appear for the counselling process, where you can choose your preferred branch (Marine engineering) in a college of your choice. I hope it helps. If you have any further questions, kindly revert.