Mo. Rev. Stat. § 162.722: Acceleration of students, subject or whole grade, when.

1. Each school district shall establish a policy, approved by the board of education of the district, that allows acceleration for students who demonstrate:

(1) Advanced performance or potential for advanced performance; and

(2) The social and emotional readiness for acceleration.

2. The policy shall allow, for students described in this section, at least the following types of acceleration:

(1) Subject acceleration; and

(2) Whole grade acceleration.