Hey Siva, 

To pursue a career in ethical hacking you need have 12th in Science Stream with IT/ Computer Science than you can pursue B.Sc in Computer Science/ BCA/ Graduation in any IT related discipline,  for 3–4 years or pursue certificate course in Ethical Hacking (CEH, CCNA, SCNS, CPTE, CISSP).This is because you need to have knowledge of programming languages such as C, C++, Python, Ruby etc. You must be computer savvy,gadget-friendly, Technology lover, dedicated, adaptable and trustworthy also very skilled in computer hardware and software. Understanding of popular operating systems such as Windows, Linux and Macintosh will be required.

There are ample job opportunities at  Government agencies, military and law enforcement agencies, defence organizations, forensic laboratories, detective companies and investigative service agencies to explore a career in Ethical Hacking. The various job designations associated with ethical hacking are Network Security Systems Manager, Network Security Administrator, Systems/Applications, Security Executive, Web Security Administrator and Web Security Manager.

You will find course oh Ethical Hacking in Dhanbad from Indian Cyber Security Solutions is the most demanded training in India. Some other institutes are also prominent in this field of education, like

Indian School of Ethical Hacking (ISOEH), Kolkata

NIIT Ethical Hacking, Multiple Locations

Ankit Fadia Certified Ethical Hacker, Multiple Locations/ Online

Institute of Ethical Hacking and Forensics, Odisha

Arizona Infotech, Pune

Quest Institute of Knowledge (QUIK), Mumbai

That's it.

Hope it helps you.