If you have any questions , please let me know. This one is correct because the "any" calls for a plural. To use the singular, you need "a" instead: If you have a question , please let me know.
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It is "If you have any question, please let me know" Using question"s" definitely sounds more natural to us, but is incorrect grammatically. "Any" is a singular and therefore needs a singular noun. "Some" is plural and therefore needs a plural noun. I am speaking of the SAT grammar, the grammar that is most accepted in the U.S. If you want something grammatically correct there it is. Sure soun