Calculus 2 Barchart Calculus 2, focusing on integral calculus, is the gateway to higher-level mathematics of which the best degrees and careers are built upon. The core essentials in 6 laminated pages can be used along with your text and lectures, as a review before testing, or as a memory companion that keeps key answers always at your fingertips. The most answers for your money in what students have said is “a must-have” study tool.