Diploma

Hi Ramaano,
First and foremost, wish you and your family a very Happy New Year 2016!
Aeronautical engineering is one of the most challenging branches of engineering. It has a wide scope of growth in the field of engineering. This field is concerned mostly with the technical as well as the mechanisms of the flying aircrafts. This is an emerging field. This field deals with the development of new technologies in aviation and defense systems. This field mainly consists of the construction, designing, working, testing, operation, maintenance of the space crafts, satellites, missiles, space vehicles, etc.
Most Universities in India have a provision to admit students globally, however, most colleges have a different provision for admission based on course duration, type of course etc. You need to contact the institute officials personally for specific admission details as it differs from one college to another.
These are the top Aerospace/Aeronautical colleges in India:
1. Indian Institute of Technology - Bombay.
2. Indian Institute of Technology – Kanpur.
3. Indian Institute of Technology – Kharagpur.
4. Indian Institute of Technology – Madras.
5. PEC University of Technology - Chandigarh.
6. Bengal Engineering and Science University - West Bengal.
7. Manipal Institute of Technology - Karnataka, Manipal.
8. Sathyabama University – Chennai.
9. Acharya Institute of Technology – Bangalore.
10. Amrita School of Engineering – Bangalore.
11. Sharda University.
12. Lovely Professional University.
For admission in a bachelor's degree, you need to complete 10+2 examination with science subject such as physics, math and chemistry. For IITs, It is mandatory to qualify in the Joint Entrance Examinations (J.E.E). The duration for this course is 4 years.
Some of the exams are:
1. UPSEE.
2. SRMEEE.
3. CET.
4. COMEDK.
5. KCET.
6. EAMCET.
7. MPPEPT.
8. KEAM.
9. GPET.
10. BITSAT, etc.
Also, some engineering institutes conduct their own entrance examination for admission.
Below is the link for institutes offering engineering: You can refine the list as per your branch and city preference.
https://engineering.shiksha.com/be-btech-courses-in-india-ctpg?sort=none&nl=0
Hope this information helps. Please feel free to revert.
Wish You Luck!

Hi, I will advise you to consider the field of data analytics. As you have a maths background you will be able to relate better with the courses like Big Data & Hadoop and Business analytics which can act like a bridge course and give you the confidence to start your career all over again. To know details about these courses please refer below links :
http://www.edupristine.com/blog/big-data-analyst-skills-and-responsibilities
http://www.edupristine.com/blog/spectrum-of-analytic-abilities
http://www.edupristine.com/courses/business-analytics-course
http://www.edupristine.com/courses/big-data-hadoop-program
You can do both these courses either in classroom or online as per your convenience