If you are good at mathematics you may try photomath , photostudy.com
Stydypool , tutorme
These are good websites where you can make upto 10$ per 10 to 24 minutes. But before becoming a tutor you have to qualify their screening test which is difficult.
If you want to answer simple questions you may try schoolsolver where people pay 1-15 $ (depending on question length and subject)
per question.
Before starting earning you have to qualify their subject quiz for which you have to pay about 3$
If you qualify the quiz then you can answer the questions and earn mone
Note that competition is high so post your answer quickly as possible as no one has answered yet .