It is best to contact the office of the institution from where ITI course was completed as a number of students are passing out from the same institution every year and may be obtaining equivalency certificate etc. from the appropriate competent authority. The application, if any, is likely to be routed through the institution concerned from where ITI course was completed or alternatively at least some authentication/verification is likely to be required from the institution concerned. Therefore authentic information can be had from the institution from where ITI course was completed. The procedure is likely to vary from state to state.