The building also houses an optional boarding school for students.

North Houston Early College High School is an optional school in the Northside.

Following the lower Secondary students may attend a three or four year optional upper Secondary school.

Enrollment in the "iT" program is optional for both Battlefield students and for those who are zone-designated for other PWCS high schools.

The secondary school program consists of three lower, obligatory years of schooling, followed by three to five years of optional, advanced schools.

All public schools in Vernon Parish are operated by the Vernon Parish School Board, which operates 18 public schools and one optional school.

In Berlin the HVD is responsible for the optional school subject Humanistische Lebenskunde, with about 54.000 participants in 2013.

Specialty, optional, expensive, study schools help students memorize questions and answers from previous years' SAT tests and universities' interview questions.

The percentage of students going on to optional middle school the same year was more than 99 percent.

The School of Environmental Studies is an optional two-year high school in Apple Valley, Minnesota, United States.