Hi, you can try with Speech Plus, Mr. Mainak Santra( appointments taken by Amit Rajak 9748778344) and for occupation Therapy contact Dr. Zahir Abbas (+919614326402).
@Arundhuti85 ..can you please tell me their address. You have any information for special educator at Newtown or salt lake area.
You can call Mr. Abbas and find out, I visit him at his Kudghat centre. He also has chambers in North Kolkata. Find out whichever is feasable for you.
As for special educators, I'm not sure about North, but at South Kolkata I know many.