BCA

To be honest, the word Best is very subjective. It all depends from person to person. There are various factors that will go into making an institute the Best for you. Academics is clearly a priority, but there are also other aspects such as facilities for research, affordability, placement opportunities, and so on. Top colleges in India who offer BCA course:
1. Institute of Management Studies Noida
2. Christ University Bangalore
3. Geeta University, Panipat
4. Xavier's Institute of Computer Application, Ahmedabad
5. Symbiosis Institute of Computer Studies and Research, Pune.

Hi,
Yes, it is possible in most of colleges. Generally, the allocation of seats to change to any particular branch is done on basis of a merit list on the score of your first-year performance. You can ask to the college directly. They will tell you more clearly.