Taught Kaplan before in medical school and made about 25 bucks per hour. It was kinda fun and something good for your CV. The best way to make money is pass step I, II, CS and III, get into a general or any surgical residency, do a couple of years of research (needs to be build into the residency), during your research year apply to get a full license, then set your self up to moonlight in a hospital for gen surg. The current pay is about 85 to 100 bucks per hour, so say you work one night from 6 pm to 6am, you will take home about 1,000 bucks (even if you sleep during the night) or if you work the weekend, one 24 hr shift pays about 2 grand. Not too bad.