Pros
When you're a college student, your employment options are very limited. Unless you're a technical genius or an upperclassman who landed a competitive internship, you're down to working in food service or working at the mall. Princeton Review lets you work doing something that, hopefully, every college student is competent at - taking the SAT. Everyone starts out teaching the SAT, but if you want to teach other exam prep courses (GMAT, LSAT, etc.) you can even if you haven't taken the exam yourself. They'll pay you to go through a boot-camp version of the course and if you get it then you can teach it. If not, hey, you got to take a $1,000 course for pay. Also, the pay is quite good (for a 19 yr old). Somewhere along the lines of $14 to $18 an hour to start.
Cons
Except for maybe 3 or 4 managers, everyone at every Princeton Review franchise works under part-time status, no matter how many hours you work. Therefore, the benefits are limited to how many test prep books you can hoard (yes, people do this, and yes this is probably stealing from the company). You work with teenagers but have no means of backing your authority whatsoever. Want to kick out a trouble maker? Too bad, because refunding the parents' thousand bucks is a thousand bucks less for the company. Nevermind if it compromises the other students' learning. Travel is also pain. You have to commute all over town and, like other teachers, you don't get paid for work you do outside of the classroom like grading, preparing lesson plans, etc. Princeton Review also recently settled a class action suit in CA for basically treating their tutors like crap and not paying them when and what they were supposed to.