Hello Rohan, your dream of becoming a scientist in physics needs a lot of dedicated time and hard work. You should first get a good under graduate degree in Physics in a good college and then you should continue pursuing Post graduation and then go for PH.D and do some research by joining as technician or lab assistant in good offices. Then with the knowledge  you can conduct some research in the area of physics and hence who conducts some research in his area of interest is called as scientist.

As you asked what institute, the quality of education varies in different colleges, for getting good education, you should prefer an IIT or NIT. If not, any good college but with determination, you can achieve your goal.

Hope this helps.

Thank you.