Poor product
They give examples sentences where you are supposed to fill in the missing article, if there should be one. Some of them read "my parents live in ______ old house in a small house" and "i would like to go to _____ Mars" where the answer to the latter sentence is "the." I would like to go to the Mars... I am sorry, but i would not personally use this product. I am not an english major by any means and I personally question their ability to write and correctly good test examples as well as answer them.