Cal. Education Code § 89707

(a) The trustees may, on the basis of demonstrated financial need and scholastic achievement, waive entirely, or reduce below the rate, or the minimum rate, fixed by Section 89705, the tuition fee of a nonresident student or a nonresident student, as defined in Section 68018, who is a citizen and resident of a foreign country, who is a graduate student of exceptional scholastic ability and prior scholastic achievement, and who, while not employed full time by a state university, is employed 20 hours or more a week by a state university or is enrolled in a full-time course of study. (b) The number of reductions and waivers granted by the trustees under this section shall at no time exceed 25 percent of the nonresident graduate students, including nonresident graduate students who are citizens and residents of a foreign country, then enrolled in the California State University.