California Code, Education Code - EDC § 46145

Commencing with the first semester or quarter that begins after January 1, 1984, pupils in grade 12 shall be enrolled in at least five courses each semester or the equivalent number of courses per quarter. If any pupil in grade 12 is required by medical prescription to attend school for less than five courses during the semester or the equivalent number of courses during the quarter, the average daily attendance allowed for that pupil's attendance shall bear the same proportion to one day of attendance as the number of courses in which the pupil is enrolled bears to five or the equivalent number for the quarter system.

However, this requirement shall not apply to pupils enrolled in regional occupational programs, regional occupational centers, courses at accredited postsecondary educational institutions, independent study, special education programs where the pupil's individualized education program establishes a different number of courses, continuation education classes, work experience education programs approved under the provisions of Article 7 (commencing with Section 51760) of Chapter 5 of Part 28, or any other course of study authorized by the governing board which is equivalent to the approved high school course of study.