defined under section 502 of the Congressional Budget Act of 1974, of the Secretary of Education providing loan cancellation in the same manner as under section 455(m) of the Higher Education Act of 1965 ( 20 U.S.C. 1087e(m) ), for borrowers of loans made under part D of title IV of such Act who would qualify for loan cancellation under section 455(m) except some, or all, of the 120 required payments under section 455(m)(1)(A) do not qualify for purposes of the program because they were monthly payments made in accordance with graduated or extended repayment plans as described under subparagraph (B) or (C) of section 455(d)(1) or the corresponding repayment plan for a consolidation loan made under section 455(g) and that were less than the amount calculated under section 455(d)(1)(A), based on a 10-year repayment period: Provided , That the monthly payment made 12 months before the borrower applied for loan cancellation as described in the matter preceding this proviso and the most recent monthly payment made by the borrower at the time of such application were each not less than the monthly amount that would be calculated under, and for which the borrower would otherwise qualify for, clause (i) or (iv) of section 455(m)(1)(A) regarding income-based or income-contingent repayment plans, with exception for a borrower who would have otherwise been eligible under this section but demonstrates an unusual fluctuation of income over the past 5 years: Provided further , That the total loan volume, including outstanding principal, fees, capitalized interest, or accrued interest, at application that is eligible for such loan cancellation by such borrowers shall not exceed $500,000,000: Provided further , That the Secretary shall develop and make available a simple method for borrowers to apply for loan cancellation under this section within 60 days of enactment of this Act: Provided further , That the Secretary shall provide loan cancellation under this section to eligible borrowers on a first-come, first-serve basis,