Possible Clues:

• H.S. dropout's document
• Diploma-awarding test, for short
• It's like finishing H.S.
• Goal for some H.S. dropouts
• Goal for some night sch. students
• Test the constructor took to create 46-/53-Across?
• Exam with a Social Studies section
• Program created for returning WWII vets
• Dropout's pursuit, briefly
• Low degree?