It is also irresponsible to implement a program of graduation exams that will result in the largest unfunded mandate in the past 50 years. The Keystone exams require school districts to provide remediation and supplementary instruction for students who do not pass. However, the state Department of Education provides no funding for remediation costs. In fact, the department claims that the exams will have no cost to school districts, even as statewide test results indicate that remediation and supplemental instruction will be required by more than one-third of students in algebra I, more than half in biology, and a fourth in literature. The exams and their required remediation could result in an unfunded mandate of more than $300 million a year. In fact, the West Chester Area School District estimates that remediation for the biology exam alone will cost local taxpayers about $250,000.