No offense but some people worry too much. The chance of getting in to UCLA varies by student. I didn't do a lot of volunteering, but i still did some; i came from a disadvantaged school in South Central L.A with crappy teachers, classes, etc.; Magnet students had priority for AP's, I didn't get AP classes till I was a senior (I had two AP classes); AND my SAT I score was at around 1300, I didn't take the ACT, didn't pass the darn AP exams, and got a 520 in the math 2 section, 470 in physics, 410 in chemistry, 380 in history, and 730 in the Spanish section; I graduated amongst the top 10 at my school and I still managed to get in.
Compared to other students, academically, I might be average or below average, but I was still able to get in. So just understand that there is no one specific standard that defines what makes a student worthy of a certain college. Colleges also take in consideration your personal statement--Yes it's nerve wrecking, but just chill