One of the main differences between the Math IC and Math IIC tests is the relative emphasis the two tests place on trigonometry. Trigonometry questions make up about 20 percent of the entire Math IIC test. In contrast, the Math IC test covers fewer trigonometry topics, and trigonometry questions comprise only about 8 percent of the test. If you don’t have a strong background in trigonometry, then the Math IC test is the test for you.