Hello,

You don't have to submit your income certificate every year, If you submit once it will be enough. You total fee reimbursement will continue for your complete course so any year you don't need to pay for your course. But you will need to maintain minimum 75% attendance to be eligible for this total fee reimbursement and not 75% attendance for total four years but 75% attendance each year if not you will loose your total fee reimbursement and you will have to pay the fees.