O.G.A. Membership Test entries under Penmanship Practice – What were they?

Under Learning Aids/ Penmanship, there appear to be monthly O.G.A. Membership Tests that were printed in The Gregg Writer and Today’s Secretary magazines.   What was/is the O.G.A. and what was the purpose of publishing them in the magazines each month?  And how would one use them now for study/practice?

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