Cal. Education Code § 8662

(a) Pupils who have demonstrated academic excellence in mathematics and science and who meet one of the following criteria shall be eligible for admission to the summer school: (1) The pupil graduated, or will graduate, from the 8th grade at a California school at the end of the school year immediately preceding the summer school session for which the pupil is applying. (2) The pupil is currently enrolled at a California school in any of grades 9 to 12, inclusive. (3) The pupil graduated from a California high school during the school year immediately preceding the summer school session for which the pupil is applying. (b) A pupil’s participation in the summer school shall not be credited toward the pupil’s completion of the course of study prescribed for graduation from high school, unless the local school district that the pupil regularly attends tenders payment to the pupil, no later than the last day of the summer school session, for all application and other fees and expenses charged to the pupil by the summer school that would not be charged to a pupil enrolled in the public school system.