I have a Droid so can't see this app and do not know how the app nomenclature is listed, but (in spite of what people on GT call them), GSSF Rules say:
Divisions are Civilian/Guardian/Master Stock, Subcompact, Heavy Metal, Unlimited, etc. (8 of them)
Special Category (Awards) are High Guardian Female, High Senior, High Super Senior, High Junior, etc. (9 of them)
There is no "Youth" category- there is a "Junior".
There are Master "Class" shooters and by extrension... "Amateur" class shooters. Those are the only "Classes".
This may all be referenced in the Rules - Sec 170-190.