TAKE GEOMETRY (or trigonometry/advanced algebra if you already completed geometry in the 9th grade) and college-preparatory English.
CHECK IN WITH YOUR SCHOOL COUNSELORS to make sure you are "on track" for college. Remember that in order for the courses you complete in high school to fulfill the University of California's admission requirements, those courses must appear on your high school's UC certified course list. Your course list is available from your school counselor, UC admission counselor, or at: http://www.ucop.edu/agguide/.
IF YOU ARE FALLING BEHIND, take advantage of resources such as tutoring and study groups. You might need to take courses during summer school to stay "on track."
ASK COUNSELORS about appropriate summer programs offered at your school, in the community, or at local colleges and universities. Check out UCSB Summer Sessions at: http://summer.ucsb.edu