MCA

For better career, one must go for better institutes. I don't know about MCA. But if you want to do MBA, give compititive exams and try getting into IIMs or other good institutes. But check the age limits for that.

Hi
you should go for b.tech in computer science first and then take your master's in cyber security management as it will train you well to understand how the virtual world works. Otherwise cyber security diplomas can be done by anyone.

Dear Umesh, decide what to study and select the universities you want to apply to.Read their admission requirements on the websites and prepare for your applications. Keep your career perspective clear and pursue a program which will help you grow rather than earning a degree.
Best Wishes

If you are really interested in IT then you can choose to take the CSIT branch in engineering as it has better options for your future.
Secondly,B.tech is not all about physics and chemistry and if you are good at mathematics,then you will do very good in B.Tech.
Wishing you all the best!