Is there any difference in meaning between saying "from law school" and "from a law school"?
Yes, there is a difference between saying "from law school" and "from a law school". If you said "from a law school" here, it would imply that the exact law school where the diploma was received is unknown, and it just came from a random law school. Without the article "a" it sounds more natural as "from law school" assumes that the speaker knows which law school the diploma came from.
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