Bachelor of Mass Media (BMM) is a three year course that enables you to gain knowledge about all types of mass media including movies and television. Since you have finished 12th, please assess whether you have the aptitude for a career in film direction. Do you have the creativity, communication skills, good inter-personal skills?.
Try and see if you can spend some time with movie or TV production units so that you can get a first hand expereince of what the careers means and needs. There are mnay TV/film intership jobs avaliable in India. Pleae register in linkedin
(http://jobs.filmmakersfans.com/guidelines-jobseekers/). While you are at the internship, try and gain more information about the life, realist chances and salary that you can expect, develop a group of useful friends and contacts that will come handy at a later date.
If you do have it then go for it. First you need to do your BMM. Among the top colleges in India are
Madras Christian College, Chennai (fees around Rs 45,000/year)
Christ University, Bangalore (around 65-70 thousand/year).
There are many colleges that you can choose form.
Good Indian colleges for BMM- (http://www.admissionnews.com/PopularCoursesInIndia/JournalismCoursesIndia-Bachelor_Mass_Media-1-20-Bachelor_of_Mass_Media_(BMM).aspx). The fees ranges from Rs 20,000 to Rs 6 lakhs/year depending on the college.
In your final year, start approaching the best TV and film production units in India to get a chance to work with assistant directors and move up the ladder. (http://filmmakersfans.com/top-24-film-production-companies-india-guide-jobseekers-film-industry/).
List of good Government colleges - (https://www.collegedekho.com/articles/top-10-government-mass-communication-colleges-in-india/).
Once you finish your internship, Start making innovative movies with your friends and keep fine tuning it.