Have the Enforce TK Birth Dates setting for Online Enrollment not allow parents to change the grade level if TK grade level is designated.
Currently, when Enforce TK Birth Dates setting is on for Online Enrollment, a message pops up saying "Please enter a valid age in order to continue" if the student's birth date does not fall within the TK birth date ranges. But the parent is able to change the grade level to Kindergarten, or a different grade level in order to continue the enrollment process. The setting allows the parent to bypass the TK birth date rules by simply changing the grade level for their student to a higher grade, when their student isn't even eligible for TK.
This idea is to not allow the parent to change the grade level if their student's designated grade level is TK based on the student's birth date. If the student is not old enough for TK, they definitely are not old enough to attend Kindergarten, etc.

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Aatkins commented
Several parents have bypassed the age requirement for TK and tried to enroll their students in Kindergarten. The birthday logic should really apply to all grade levels. For instance, in California, the cut-off date for age is on or before September 1st, meaning if a student doesn't meet the age limit by September 1st, they cannot enroll in that grade.
This might prove difficult as states have differing age limits.
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Ratna Dube commented
Our elementary sites are bringing up this issue quite often, would love to see a fix for it.