M.Tech

you should try any colleges but branches should be choose wisely. Delhi Technical University or those colleges which conduct their own entrance exam like Jamia Millia Islamia offers a fare chance to those candidates which has not a very good percentile.

You may evaluate BITS Pilani WILP MS Software System which is conducted by Web based Technology.

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.