Ok if a student is not a good test taker like can't focus is it ok to allow that student to chew gum or suck on a piece of candy to help? Is that giving special attention to one student or should you give it to all the students in the class?
Peppermints are great for all students. I've even heard it helps them concentrate more! If it's a standardized state test, I'd check with the rules first.
Peppermints are a great idea because when I was in school and we took big test our teacher would give us peppermint and it did help focus me.
This solution is useful.
Another approach may be to invite students to bring in their own peppermints or candies for testing. This way you don't have to supply them all (still give to the one student if needed), but you are not singling any one student out.