M.Tech

You should visit the website of isro if any such project is sponsored for students you can apply for it. You should take advice from your supervisor or head of the department. Many projects are only offered to the faculties and than after you can work on that project. Institute of engeers India and other may societies also offer project to the m.tech student but through the guide or supervisor.

Download the syllabus start solving last ten year questions papers, find out the area from where marks came in previous year. Focus on those area and start with your strongest portion

After BCA you can do M.C.A from IITs or jawahar Lal Nehru University or other premium institutes. I think Gate is not required for IITs but JAM is the test but to be sure you should visit any IITs or Isc Bangalore website.

Additional qualification is always very good. MTech will open new door of opportunities for you. All the Best!

First of all u should do btech.
N if u have a strong will 2 b an IITian. then why should u wait for Mtech.
Do it know . Take drop n perform well in jee advanced. n also give improvement of class 12th.

The preferable would be to do it separately as is the general norm still in India. In this case you may even change your college for M.Tech and can try for IIT, but you need to give an exam in between for M.Tech. But still I think doing separately is preferable Harish.

You should choose it as your area of interest. You should review your B.Tech courses which ever is your favorite subjects. You may go for manufacturing or production or any other branches of your interest. But it is also important, in which college you are getting admission, if you get some IITs,it is best.

There are many colleges which provide part time M.Tech after a certain level of work experience. It may be two or three year experience. In part time M.Tech you have to attain course work either regular mode or on the weekends.