CBSE 12th

Hello
To study cyber security you must be of 18 years of age
You can go ahead with Certified Ethical Hacker Course of Eccouncil USA it will make you basically strong in information security field then you can go ahead with ECSA, (Eccouncil certified security Analyst) after that when you gain some experience then you can do CISA (Need 3 years information auditing and security experience) but for better job prospects you need to be atleast graduate preferably in IT so you can also do BSCIT or BCA as your Graduation after that go ahead with Msc (Information security)From University of Madras or you may can have MCA degree
after having 5 years of experience you can do CISSP
as per career prospects after 12th and CEH its tough to get good job you must atleast Graduate preferably in IT
You can be
1) Information security Trainer
2)Security Analyst
3)Penetration Tester
4)Cyber Security Expert
5) Malware analyst
6)Secure Programmer
7)Information System Auditor
Remember one thing it is emerging industry and have very depth potential of career prospects and very high paying job all depend on your expertise and experience
Hope this will help
Best of Luck

Dear Mr. Ashish,
Yes why not,you can surely target best B-Schools with average academics records provided you should have good percentile in management competitive exams i.e CAT/MAT/XAT/CMAT/SNAP etc.
List of Best B-Schools:
IIM(13 all over the country)
XLRI,Jamshedpur
FMS,Delhi
Management Development Institute, Gurgaon
Indian Institute of Foreign Trade, New Delhi
ISB,Hyderabad
NARSEE MONJEE,Mumbai
S.P JAIN ,Mumbai
L.B. Shastri Institute of Management Mumbai
Fore School Of Management, New Delhi
Asia Pacific Institute Of Management, New Delhi
India Management Institute, New Delhi
Birla Institute Of Management, Noida
IMT,Ghaziabad
These are best places to pursue your MBA in india
Good luck!