Science

Dear Bharat,
B.Tech is a better option as it is a professional degree/ course, whereas, B.Scn and BCA are not professional but are simple/ regular degrees. These days we have many branches available for B.Tech. Some of them are there for long like ECE, CSE, EE, Mech., Civil, etc. But with the passage of time, the impact of technology has increased due to which many new branches have come up like Biotech, Food Tech., Nanotech, Agri., Mechatronics, etc. Many reputed private universities are offering these B.Tech specializations. They have different criteria for admissions. Some offer admission on the basis of JEE scores, some offer admission on basis of their own tests and some offer admission on the basis of both. Some even offer direct admission on basis of class 12th marks. Some of the universities also offer scholarships on basis of your performance in class 12th or JEE or their own tests. You can check the details of any of the reputed universities like VIT, Lovely, SRM, etc. All these universities have wonderful infrastructure and world-class facilities to offer to students apart from good placements.
Good luck.

Dear Lakshay, there are many courses that you can opt for after class 12th. B.Tech is all time favorite, but then life doesn't stop here only. You have various other good options available.
If you are interested in pursuing a course in science, you can go for various B.Sc like Physics, Chemistry, Maths etc. Other than these, you have specialized ones like Biotechnology, Biochemistry, Microbiology, Forensic, Agriculture, Food technology, Computer Science, etc. Apart from these you have honors courses too. You can also go for paramedical courses like Pharmacy, Ayurveda, etc.
Other than science stream, you can have a career in Journalism, Film and TV production, Management, Hotel Management, Fine Arts, Performing Arts, Physical Education, Yoga, etc too.
There are many reputed universities like Lovely Professional University, VIT University, SRM University, etc that are offering a wide variety of courses to choose from. Some of the universities offer good scholarships too.
Check some of these universities for more details.
Good luck.