The Princeton Review reviews

There is a lot of prepping involved if you want to to teach a class, which could take longer than you are compensated. Management and clear instructions are sometimes lacking.

Hard to get work over the summer. Amount of work available/given can be unpredictable. You sometimes have to drive a lot (ie class site to class site), as opposed to staying in one place like with an office job. This can be irritating in Los Angeles.