To independently expand your SKETCH experience into an AP Art History course, high school students will need to complete additional work at home. Below are a few links to point you in the right direction.
AP Art History books:
http://www.collegeboard.com/html/apcourseaudit/courses/art_history_textbook_list.html
AP Art History guidelines and images of all 250 works included in the test:
https://apcentral.collegeboard.org/pdf/ap-art-history-course-and-exam-description.pdf?course=ap-art-history
Testing details:
https://apcentral.collegeboard.org/ap-coordinators/exam-ordering-fees/ordering-materials/home-schooled-students