best way to make some side money

i'm a 17 years old student and i want to make some side-money in free time. got any tips? i tried survey sites but i didn't really like them. i tried trymyui and usertesting and i actually enjoyed testing a lot, however trymyui seems to have died out, as i didn't get any tests for 3 months (my rating is 4.5 starts) got any good testing sites to recommend? any other way to get some cash online?