For your application to be valid, you must declare that you have a suitable skills assessment at the time of invitation. You will need to provide a copy of this skills assessment with your application. Your skills assessment must have been obtained in the 3 years before the date of your invitation. If the assessment was for a shorter period, that period must not have passed. If your skills were assessed on the basis of a qualification you got in Australia when you held a student visa, the qualification must be from studying a course registered on CRICOS.