The Indiana Department of Education says it could revoke state accreditation for high schools that abuse waivers allowing students to graduate without passing a state exam.
About 6 percent of the state's graduates earned a diploma during the last school year because of the waiver. That's about 3,300 students out of a graduating class of 58,000.
Fifteen schools grant waivers to more than 20 percent of their graduates.
State Superintendent of Public Instruction Suellen Reed says the state will consider the percentage of waivers at a school when it reviews it for accreditation every three years.
Most of the 15 schools with the highest rates of waivers are in the Gary and Indianapolis school districts.