Saint Jeanne de Lestonnac School is a charter member of the California Junior Scholarship Federation (CJSF), an affiliated high school chapter of CSF. All students in grades seven and eight, throughout the state of California, are eligible for membership based on the trimester report cards, beginning with the end of the first trimester of seventh grade. The organization's motto is "Scholarship for Service", and “active” members of CJSF are expected to attend regular meetings, pay their dues, and to participate in a variety of service projects directed by the faculty advisor and the administration.
Students must apply for membership by the deadline designated by the advisor. Every application must be accompanied by the most recent report card to verify eligibility. Students receive three points for every solid subject "A", and one point for every solid subject "B". A minimum of ten points is required in order to be eligible. There are five solid subjects that are considered for membership: religion, mathematics, social studies, Language Arts, and science. Even though no points are awarded for other subjects such as Physical Education, Fine Arts, Spanish, Independent Reading, etc.; students may be disqualified for membership if they do not meet the minimum requirements as stated in the CJSF application available at the beginning of each trimester. Students who qualify for CJSF and NJHS in June of the previous year are recognized in the fall after the first mass of the year.