This app is helpful in some areas, and not so in other areas. English grammar is unique in that it includes several accepted forms of "english." American English, vocabulary and punctuation differ from U.K. English, South African English, and other accepted english forms that are in use today. Here are a couple of examples. The app refers to a declarative sentence as an assertive sentence. This is not American vocabulary. It also neglects the comma that precedes a coordinate conjunction. In grammar construction, coordinate conjunctions are used in compound sentences; they always require a comma, and can never be used to begin a sentence.
If you are looking for something to teach generic ESL grammar concepts, this will likely do. I would not use it for PSAT, or any other standardized test preparation. If you are looking for scholarly assistance in writing your college papers or graduate thesis, try a good reliable standardized english grammar textbook.
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Kelly Trammell
English Tutor
PreciousDolly