sentences:  By Pennsylvania School Board regulations, for the graduating class of 2017, students must demonstrate successful completion of secondary level course work in Algebra I, Biology, English Composition, and Literature for which the Keystone Exams serve as the final course exams.Students’ Keystone Exam scores shall count for at least one-third of the final course grade.In 2011, Pennsylvania high school students field tested the Algebra 1, Biology and English Lit exams.