Aviation

I would say first of all focus on your 12th board, you need above 55/60% in physics, maths and English for certain flying schools. It's good that you've decided it in 12th itself. If you get time during your 12th, I would suggest first of all undergo your class 2 medicals, it won't take much time, about 56 hours depending on the hospital. Here is the list of DGCA class 2 medical examiners:
http://dgca.nic.in/medical/class
Check whichever is nearest and take an appointment. But do check the validity of class 2 medical, I'm unsure. Meanwhile, check out flying schools in India, here is the list of a few good ones.
IGRUA, Rae Bareli (Indira Gandhi Rashtriya Udaan Akademi)
CAE(NFTI) Gondia (National Flying Training Institute)
MPFC Indore (Madhya Pradesh Flying Club)
Bombay Flying Club
Rajiv Gandhi Aviation Academy, Hyderabad
Chimes Aviation
Academy of Carver Aviation
There are more flying clubs. So, I would suggest pick a Sunday/ upcoming Diwali holidays to surf all their websites and talk to the ones you shortlist. Know about their entrance exams, if any, fees, when are you eligible for exams etc. I would personally suggest first 2 flying schools in the above list IGRUA and CAE Gondia, both of them charge higher than all others but the quality of training is amazing. Do check out their websites. They both conduct entrance exams thrice a year but I think you'll be eligible to appear only after you get your board result.
After finalising the flying school, get to know about their entrance exams, talk to people who are studying there or have given these exams. Start preparing for their entrances before or after boards, that's up to you. After your 12th boards, apply for class 1 medical appointment, undergo it. It takes a few months to get the certificate. Read the medical procedures at DGCAs website. There is also a Cadet Pilot Program run by CAE Gondia and IndiGo in which you have job security post training. Check that out too, its expensive but there is job guarantee. Make wise choices.

Jain University:
M.Tech in Aviation Management - ( BE / B.Tech In Aeronautics / Mechanical / Electrical / Electronics / Electronics & Communications / Electrical & Electronics / Civil / IT / Computer Science discipline from a reputed University with minimum 50% marks in aggregate (45% in case of SC/ST candidates) are eligible).
M.Tech in Aerospace Engineering (Avionics) - BE / B.Tech in Electronics / Mechatronics / Electrical /Instrumentation / Computer Science / Telecommunication with not less than 50% in aggregate with GATE / PG (CET) score. Link: http://iiaem.jainuniversity.ac.i. National Aerospace Laboratory (NAL).
NAL is offering:
Stipendiary training programmes
Project Assistant Programs
Jr / Sr research fellowship programs
For students in different disciplines to get an exposure to the various facilities and S & T developments and to take part in the ongoing R & D programmes of NAL. Link : NAL-Apply online.
Institutes offering MBA in Aviation Management (Eligibility - any graduate) .
University of petroleum and energy studies – Dehradun.
Nehru College of Aeronautical and Applied Sciences.
Avalon Academy,
Hyderabad offers MBA in Aviation in part-time mode.
Banasthali University Rajasthan.
More about Careers in Aviation Industry
Aviation Industry is a subject with endless possibilities for career options. AE / ME students can choose their career in design, development, production, operation, and use of aircraft. They are placed in some of the top aeronautical and other industries in India such as:
Hindustan Aeronautics Limited (HAL)
National Aerospace Laboratory (NAL)
Taneja Aerospace Limited (TAAL)
ISRO
DRDO
Mahindra and Mahindra Aerospace
TCS
Infosys
INFOTECH
These aeronautical industries are also inviting (B.Tech) CS Graduates as software developers. P. S : Complete your B.Tech in CSE with good percentage and try to secure good GATE score. Apply for (scientist/engineering ) jobs in HAL, NAL, TAAL, ISRO, DRDO. All the Best.