Dear,

To become a scientist you can Join ISRO. Indian Space research Organization conducts its own exam every year for B tech students as well as for B. Sc students.Even you can go For DRDO Exams which is also conducted every year or depends on vacancies available. After B.Sc If you do M.Sc chances will be more as scientist. JEST is the best exam for scientist specially for candidates belonging to Physics field. It offers you a job as scientist in the following Institutes:

1. BABHA ATOMIC RESEARCH CENTRE, MUMBAI

2.INDIAN INSTITUTE OF ASTRONOMY, BANGALORE

3. IISER, PUNE

4.NATIONAL INSTITUTE OF SCIENCE EDU. AND RESEARCH, BHUBNESHWAR

5.SAHA INSTITUTE OF NUCLEAR PHYSICS

6.PHYSICS RESEARCH LABORATORY, AHEMADABAD.

any many such Institutes.You must have 65% or above in your M.Sc or B.Sc.

Hope this helps!