The board of a school district may grant a charter to an eligible entity for a chartered educational clinic. The application requirements and procedures for such a contract for a chartered educational clinic are the same as for a contract for another public school academy. A chartered educational clinic is a specialty public school academy and shall only serve public school pupils described in this section during hours outside the pupil’s normal class hours by providing special assistance for up to 3 hours per week, pursuant to a written prescription by the principal of the public school in which the pupil is regularly enrolled on recommendation of a teacher of the pupil. A public school pupil enrolled in grades K-12 who is in educational difficulty or is at risk of falling seriously behind other pupils of his or her age level, of not being advanced in grade level, or of dropping out or being expelled from school may be served by a chartered educational clinic.