Data Entry is a term often mis-used by fraudulent employment offers, that are just looking to collect some sign up fees from you.

Odesk.com is one example of a freelance marketplace with such work, Odesk has about 420 different online qualification skill tests you can take to help win job bids.

https://www.odesk.com/tests

This question is asked dozens of times daily on YA. No one knows of any such work.