Samples of Keystone Literature, Algebra 1 and Biology questions from the PA Department of Education can be found at the link below.  Click on ITEM AND SCORING SAMPLERS found on the right hand side.  These are valuable resources in preparing for the assessments.

http://www.education.pa.gov/K-12/Assessment%20and%20Accountability/Pages/Keystone-Exams.aspx#.VUt1V010zcs