Study Helper is a system that is easy to use and free. It's a system that will question you on questions you previously added, but your answers do not have to be exact, you simply choose keywords so that you only have to get key words for your definition, words that are vital to the definition. That way accurately testing your knowledge!
How it works?
It works by searching for keywords in your answer, and if the correct answer contains all those answers then it will give you a correct result