When I was a student I never know about earning online job, I wish I had knew this before but I just discovered this one when I went overseas. I think if you are a student you can do virtual online job and you can do that on fiverr and or you can do selling clothes or shoes or bags online and offline. Most students can do that because they have classmates where they can sell the stuff.
Working online like call center job, or you can do transcribing at transcribe me. You can try also applying at Odesk, Amazon truk if its available in your area, User Testing, Answeree of course, Microworkers, Remotasks, and the like. Working online need really long patients and perseverance because you don't always earn the same. You can do online teaching jobs too.