Dear Vansh,

   You are already studying Science in 10+2, for your graduation studies, so, you can go for Bachelors in Physics or Mathematics or  Aeronautical Science. After completing your Bachelor's you need to go for Masters and Ph.D levels.  The Inter-University Centre for Astronomy and Astrophysics, Pune, India is one of the best institutes offering Ph.D programs . They do not offer Masters  program in Astonomy  but they do offer Masters in Physics.

For Ph.D programs

The students are usually taken after screening, so the entrance tests are :

IUCAA-NCRA Admission Test (INAT) 

INAT is conducted jointly by Inter-University Centre for Astronomy and Astrophysics and the National Centre for Radio Astrophysics, Pune in the month of December every year in Pune

Joint Entrance Screening Test (JEST) 

This test is usually conducted at IUCAA, Pune across India on the third Sunday of February each year. 

CSIR-UGC NET for JRF (Physics) 

Only those who have qualified for the Junior Research Fellowship (JRF) in the previous two years are eligible to apply. 

Wishing you all the best !

Hi Vansh, 

You need to pursue your 10+2 in Science stream. After 12th, you can pursue B.Sc in Astronomy or B.Sc in Geophysics or B.Sc in Physics or B.Tech/B.E/B.Sc in Aeronautical Science. Once you complete your Bachelor's degree, you will have to appear for entrance exam and interview for getting admission into a PhD course in astronomy/astrophysics. Work hard and fulfill your dream.

Best of luck!

You should be master in Physics and Math after taking Science in college for being an astronomer, and I must say that you need to be a good pilot also it means that you need certain hours of flying experience too.