Notgrass “Exploring America” high school curriculum - by completing all assignments your student will earn 3 credits — Social Studies, Bible and English. Like New! With 2014 copyright. A newer version has been issued. My student did not write in the workbook or test booklet. My student has Convergence insufficiency and had trouble with the type face so they only did 1 or 2 units before opting for something else. It is practally unused!