From the Makers of Varsity Learning Tools - Best Education App - 2016 Appy Awards. Have you already taken Calculus 1 and now you are moving on to Calculus 2? Are you unsure of your potential performance, and perhaps Calculus 1 may have been a struggle for you? You are not alone, and the Varsity Tutors Calculus 2 app for Android devices is here to help.