"Micro query" in Mcgraw Hill educational books, does it refer to Microbiology or opposite of Macro?
The book contains explanation of a lesson followed by some questions to measure students' understanding of the subject under the title "Micro query".
When I googled this term I found there is a type of question called micro and macro questions.

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Think of it is a mini-test or mini-quiz, just testing your knowledge of a little bit of what you learned.

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In the context you mentioned it would refer to small, opposite of macro.
Another way of saying " a review"
I hope this helped
Regards
Darren