I want to pursue ECCE Course at St. Xaviers. I want to know whether they offer this course and what are the cost for this course

You will need to contact St Xaivers and ask them. This is an international question and answer site, and we are not connected to Xaiver university.

Plus there are at least 10 Xaiver college or universities around the world. Which one are you speaking about? the one in India would be my guess