It is not worth free!
Stay away! I get the feeling that some of the positive reviewers are makers of this software. If I could give it zero stars, I would. The layout of the testing is nice, but there are so many weaknesses with it. It gives you a definition of a noun, but does not give you an example. Then it test you on say noun usage and it says that two of the fives sentences will test you on the usage, but then it does not tell you which questions are being used for noun usage. I have to agree with another person, when you get an answer wrong, there is no explanation as to why you got it wrong. This application has a long way to go and it should be reviewed by an english professional or professor.
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Grammar Up : Lite Edition