CBSE 12th

Hello Aniket,
Don't get too fascinated with "ethical hacker" as they show in movies. Hackers mean "thieves". No company would hire a thief to steal other company's data as that could land them in serious legal trouble. Further, hacking requires a deep knowledge of computer programming and the functioning of computer and networks.
What I would rather recommend you is go for security specialist professionals. These jobs are highly payable and in high demand as most companies need them to protect their own data.
For the same, you can go to some reputed computer training institutes like NIIT, etc. You can go for Java courses (all modules) followed by networking and CCNA/CCNB (CISCO) courses.
Pursue the course alongside any computer related degree course (BCA etc.) for better outcome.

Hello Aayush,
Commerce and Science are the two broad categories. In commerce, you can go for arts/design, business, finance and banking. In Science, you have engineering and medical. Some new streams are also in demand nowadays like bio- tech, nano technology, agriculture and genetic.
Students are also moving in fashion designing and interior designing. We have B.Arch exam for such students. The research oriented students can go for KVPY and get into institutes like IISC and IISERs. Commerce students can also go for CA.
There are courses like mechanical/ electrical and computer Science in engineering to newer ones like hotel management and fashion designing. You can opt for any of these as per your interest.
I hope it helps. If so, kindly upvote this answer. If you have any further questions, kindly revert.

Hello Hari,
To start a career in advertising, the minimum qualification one should possess is to clear High School Exam with 70%. Most advertising agencies recruit candidates with a formal management or advertising/mass communication qualification. Preference is given for MBA's for posts in the market research, client servicing and media planning departments.
In the creative department, a general BA with a command of the language of communication plus knowledge of designing packages like Photoshop, coral draw or fine arts is the requirement. However, to get a job in good organization one should have degree or diploma course in the field of advertising. There are number of colleges offering these courses in India. One being a graduate of any field can work in other department of advertising according to his/her qualification.