Ironically, as a Poly-Sci major, you're probably much better prepared by your college experience to handle Primary than I was as an ME. First off, Aero is written for you, as a Poly-Sci major to be able to get it in the few weeks allotted (while the Engineering majors nuke the shit out of the technical inaccuracies of the curriculum). Secondly, being well-versed in cramming tons of reading into your skull and pulling out what's important, you will be at an advantage compared to Engineering majors, who are used to being taught a process and making problems fit into that process - Primary is a boat load of rote memorization. Engineering problem solving becomes an advantage much further down the road.
Crack some books, some beers, and some ass.