SAT tutoring - you can work flexible hours & via Skype. I've been able to make a full-time salary working a few hours a week tutoring while getting startups off the ground.
I applied to Kaplan straight out of high school and started telling everyone I was going to work there before getting hired [I was not]. Instead of making $16/hour I ended up getting privately hired at $25+/hour by my classmates' siblings. At Brown I applied to Ivy Bound - they work with students across the country, both in person and via Skype. For my first job, at 19, I was paid $40/hour plus $90 just for travel, since I was the only person willing to head over to Newport to tutor at the boarding school there. After that, I began increasing my rate by about 50% each year. I jumped to $100/hour one summer because a family really wanted to hire me, I didn't think I had the time, and I asked for that rate because I figured they'd say no [so I wouldn't have to] - and if they didn't, it would be more than worth my time. They said yes, and it was. I still work for Ivy Bound and take private referrals in NYC through friends. Best side job ever, and I love the students I work with / trying to get them to stop stressing over the college admissions process.
