Talk to the student's teacher. He may be willing to work with the student before or after school and during the summer to help him catch up or learn more challenging subjects. If not, instructors often know where you may find tutoring assistance elsewhere. During the school year, a teacher's assistance should be free, but you'll likely have to pay for tutoring that takes place at other times.
Contact the guidance counselors at your local high school. Many schools have homework assistance programs that are administered by counselors. Even if they don't work directly with the programs, they'll know what help is available.
Ask teachers, principals and guidance counselors for names of students who might make good tutors. This is a good option if you don't have money budgeted for tutoring, since professional services likely cost more. High school and college students, in particular, may be able to tutor for credit instead of pay, and some students may be willing to donate their time.
Parents who have students tutoring their children should supervise sessions closely. Be sure the tutor models problems, is patient and understanding, and is not doing the child's homework.
Call your school district office to ask about after-school programs. California offers 21st Century Community Learning Centers and 21st Century High School After School Safety and Enrichment for Teens, programs for K-12 grade students that may include tutoring. Tutors in these programs must meet minimum standards of education and training. Although districts may charge for the program, the state won't let ability to pay be a factor in acceptance, so ask even if you feel you can't afford it. If you can't find a district coordinator, call the state office at 916-319-0923 to find out what programs exist in your area.
Check the California Department of Education website for approved tutoring facilities.
Phone a local library. Many community-based tutoring programs, particularly those that help non-native English speakers learn the language, meet in city libraries.