Hi Arul,

To become a Theoretical Physicist, you have to first clear your 12th standard. Then, you have to join a B.Sc. Physics course. After completing your B.Sc, you need to go for an M.Sc. Physics. Then, you can do your Ph.D, preferably abroad. Once you have your Ph.D, any research institute will readily hire you. Keep in mind that you will need to have immense concentration and determination on every step of the way.