Normally, you enter college with the idea that algebra is connected to the manipulation and solution of equations. For a lot of the students calculus is hardest aspect of mathematics. Calculus is a significant portion of mathematics.
If you feel any issue, there are a number of online resources which can help you out in studying calculus. From this, the Pythagoreans developed lots of ideas and started to develop trigonometry. If you are in possession of a very good understanding of algebra, you should probably just skim this section to be certain you are acquainted with the ideas.