Yes, you can file RTI to EDCIL .
EdCIL (India) Limited is a Mini Ratna Category-1 CPSE continously profit making and fast growing CPSE under Ministry of Human Resource Development offering management and consultancy services in all areas of education and human resource development, both within India and overseas. It comes under public authourity as per sec 2(h) of RTI 2005 act, hence you can file RTI.
