The ESA statute (A.R.S. §15-2402(B)(3) requires that while a parent has a contract with the ESA program, a student cannot receive both ESA and STO money for the same period. The ESA program states that student may utilize an STO scholarship up to the start of ESA funding. Funding from the ESA program is on a quarterly basis and begins in the quarter following acceptance to the program. Once ESA funding begins, any outstanding STO scholarship money must be refunded by the private school to the STO.