On thing crucial in your case is that you look for a school familiar with the Indian regulations and requirements as far as logging your training time.
If you find a good school who is not familiar brief them on the requirements.
You also need to fly certain aircraft types to be eligible for conversion by the DGCA.
This list may not be all inclusive as I've found it through a google search but it shows aircraft acceptable to the Indian Aviation authorities:
http://dgca.nic.in/Type_Acceptance/L...0by%20DGCA.pdf