Varicella Chickenpox), Meningococcal, and Tdap (Tetanus, diphtheria, and pertussis). The Health Heroes Texas form must be completed correctly and turned in by April 13th for your student to receive the required shots on April 20th. This is a great opportunity to get this important task completed. No charge for an office visit and no need to take your student out of school or have to delay enrolling in August. Without proof of these immunizations, your student will not be allowed to enroll in the 7th grade.