CBSE 12th

Hello Aniket,
You should not get too fascinated with ethical hacker as they show in movies. Most of the institutes provide just a basic fancy course under the name of ethical hacking, just to attract students and earn more.
I would rather recommend you to go for security specialist professionals. These jobs are highly payable and in high demand as most companies need them to protect their own data. These jobs work on the same logic that the best thief can protect the data in the best way.
For the same, you can go to some reputed computer training institutes like NIIT, etc. You can go for Java courses followed by networking courses and CCNA/CCNB (CISCO) courses. After this, you can also opt for CEH (Certified Ethical Hacker) certification courses, if you wish to.
Ensure you do these courses alongside a degree course (BCA, B.Tech, B.Sc, etc.) for better outcome.
I hope I have been able to answer your queries to your satisfaction. If so, kindly upvote this answer. If you've any further questions, kindly revert.

Hello Sonu,
In such a case, I would suggest you to appear for improvement examinations. You might think that it will take another year of your career and most colleges have a minimum requirement of 50+ percent, but it causes a lot of trouble during placements.
If you opt for college, rather than improvement examinations, your college life will go on smoothly, but at the time of placements, you might not be allowed to appear for certain companies if your overall percentage doesn't meet their criteria.
So, I would suggest you to focus hard on your improvement examinations, score damn good and make this additional year worth. Rest is your choice. All the best!
I hope I have been able to answer your queries to your satisfaction. If so, kindly upvote this answer. If you've any further questions, kindly revert.