Everybody likes the smell of vanilla. Everybody but bugs, that is. Dilute 1 tablespoon vanilla extract with 1 cup water and wipe the mixture on your exposed skin to discourage mosquitoes, blackflies, and ticks.
To begin kindergarten in the state of Illinois, a child should be 5 years old on or before September 1 of the kindergarten year and live within the boundaries of the school district.
I believe preschool is for younger children between the ages of 2 and 3. Pre-K would encompass those from 4 up to 5 yrs of age. Generally, parents won't register children in school when they are 5, these children will just enter regular kindergarten. It is really up to the parent and the school/academy they choose.