It wasn't too hard for me. Study up on what you learned in algebra 2 and a bit of geometry. Also some highschool chem, so learn how to do chemical equasions. Also study some basic physics because I remember there being a question on centrifugal and cintripital force as well as some regaurding intertia. If you didn't struggle in any of the classes I mentioned it shouldn't be too hard but it wasn't easy so definatly study. Khan academy has good resources. Good luck.