C2
C2 builds on some of the ideas you learned in C1. For this reason, lots of people find C1 quite easy after C2.
You will learn more about algebra, including how to do long division. In C1 you learnt equations of straight lines; in C2 we move onto circles. In C1 you learned about arithmetic series; C2 develops geometric series. In addition to this we have two new topics: logarithms and trigonometry.