MCA

Hello Chiya,
Absolutely fine to go with M.Tech but it all depends upon you that how you want to utilise that degree. M Tech will always make your preference over other competitors but that will all matter if you have gained knowledge like to be in M.Tech else it will just be a piece of paper with some great words.
MCA can also be enough for you if you have great knowledge of things and you have interest in that area.
Good luck.
Thank you.

The answer is simply 'no'. MCA is a post-graduate course which you can't pursue without an undergraduate degree. So, you need to complete your class 12th and get a Bachelor's degree in hand for that.

You can refer following colleges:
College of Engineering, Guindy
Velammal College of Management and Computer Studies
GKM College of Engineering and Technology
Jaya Engineering College
Jeppiaar Engineering College
Check the below link for more colleges-
https://www.shiksha.com/it-software/colleges/mca-colleges-chennai

MCA has better career options than MBA in IT. It depends on your career goals also. MCA is purely a technical field and MBA is purely management course. Although in MBA IT, you would be given technical knowledge also but it will be theoretical. It's purely based on managing the IT infrastructure and IT management. MCA includes software development and testing, etc. which a pure technical course. Both the fields have equal opportunities but MCA is slightly better.

B.Sc IT would be a more suitable option for you.
Eligibility
Graduation and a bachelors degree obtained through the 10+2+3 system or an equivalent qualification with a minimum aggregate of 50% or equivalent CGPA of any of the Universities incorporated by an act of the central or state legislature in India. A relaxation of 5% aggregate is there for SC/ST candidates.

Hi,
Top US universities such as Harvard, MIT, etc. do accept 3-year Bachelors degree. However, there is no MCA abroad, this is specifically a degree only awarded by Indian universities. You may check for MS Computer Science, Applied Computing, etc.

Hi,
Distance education is still eligible if you apply for private colleges or institutes but full time is required in public colleges.

You can go for Software testing, database Engineer, Web Designer, Technical Support and Network Engineer.