Hello V.S.R.D.Vinay Kumar,

Education required for becoming an astronaut:

• After your 10th grade you will have to take up Physics, Chemistry and Mathematics as your main/core subjects in your 12th grade.
• After that do your Bachelor's degree from a recognised university. You can take up subjects like physics, chemistry, mathematics, biology etc. in your Bachelor's. However, It is suggested that in your Bachelor's you do courses in aerospace or aeronautical engineering and avionics and then your Master's and Ph.D in the same.
• Keep a perfect score in your 12th, Bachelor's and any other degree you pursue. The higher marks you secure the better are your chances. Since there are multiple people applying for this and this job is in huge demand, the chances of you getting in are very low and thus to maximise your chances, you should secure maximum possible marks.
• After your graduation you can join the ISRO by sitting for Joint Entrance Examination (JEE). For joining NASA will have to appear for the NASA Space Physical.
• Try getting an internship with such fields so that you know the basics of the field experience involved, this will further enhance your chances of employability.
• It will be advisable to either join the Air Force or Indian Space Research Organisation (ISRO) prelimnarily and then join an astronaut training programme. This will give you the required field training.

Other skills one need to possess in order to become an astronaut:

• Candidates must adhere to certain standards in the physical tests conducted. These standards being that the blood pressure of the candidate applying should 140/90 in sitting position, they should have a 20/20 vision in each eye, and the height of the candidate should be between 62 to 75 inches.
• Candidates must be free of any disease. All his joints must be functional and he should have normal range of motion. The candidate must be independent of drugs, alcohol or tobacco. The candidate should not have any psychiatric disorder i.e. he should be of am sound mind.
• The candidate must demonstrate mental, cognitive and personality capabilities to enable him to work in highly demanding physical, social and intellectual environment.
• The candidate  should be physically fit. Physical fitness is very important for this job at it is a very physically demanding job.
• You should have good communication skills and a hold over the English language.
• You should have the ability to work under challenging and high pressure situations. You should be a team person.

Colleges offering courses in Astrophysics/Aeronautics are:

• Indian Space and Research Organisation (ISRO), Bangalore
• Osmania University, Hyderabad
• Andhra University, Vishakhapatnam
• Punjabi University, Punjab
• IIT Bombay, Mumbai
• Indian Institute of Science (IISc), Bangalore
• IIT Madras, Chennai
• IIT Delhi, New Delhi
• IIT Kanpur
• Tata Institute of Fundamental Research (TIFR), Mumbai
• Delhi University
• IIT Kharagpur
• IIT Madras
• Indian Institute of Space Science and Technology (IIST), Trivandum
• Indian Centre for Space Physics, Kolkata
• Savtribai Phule Pune University - Department of Atmospheric and Space Science, Pune
• Cochin Institute of Science and Technology - Department of Atmospheric Sciences, Cochin
• IISER, Bhopal
• IISER, Kolkata
• IISER, Pune
• Madras Institute of Technology (MIT Madras), Chennai
• Manipal Institute of Technology (MIT Manipal), Manipal
• Indian Institute of Space Science and Technology (IIST), Thiruvananthpuram

Scope and job opportunities after this:

• NASA and ISRO are the dream places where every aspiring astronaut wants to reach. However in these place there is a different hierarchy of jobs which exists.
• If you are an astronaut then you will most likely be paid really well.
• Other job positions which exist include those of working astronauts and astronaut trainees who work under the senior astronaut. The pay packages also differ based on your position.
• The life of an astronaut, however, is a very tough life and it involves a lot of sacrifices on an individual's part. You will have little to no family life and the training circumstances are equally as strenuous.

All the best!

I hope this answers your queries.

Do revert back in case of any further questions.