Whether for high school students or adults, you can monetize your expertise by teaching people with less experience or knowledge than you in that subject area. You can work with an established group like Kaplan for, say, SAT tutoring, or you could try hanging out your own shingle and making your services known either to students, parents and schools in your community. If you are targeting adults, you can create your own website or list your services with adult tutoring companies.
It’s kind of like going the tutoring route, except you’re teaching English with a company like VIPKid (a big favorite of fans in our Ramsey Baby Steps Community on Facebook). Now, if the word teach makes you a little nervous, don’t worry. They’ll handle all the lesson plans and grading for you. But you do need to want to help others learn and be willing to guide a class online. Getting paid while helping others? This one is a win-win!