Don't bother with UCLA if you're not in community college, they expressly state there is a bias for community college kids. It's not too late to apply, but columbia is the most sought after. Last year, I know that case reached out to me because they had an extra space, even though I didn't apply there. So that's a good place.
There are 2 essays, a personal statement and diversity essay. I wrote that I wanted to become a doctor because both my parents had/have cancer (breast and brain) and I was in the hospital basically all my life and what I did there etc etc.
Requires 2 LoR, but they seem to place more importance on essays and activities. You should apply soon though.
Edit: btw, I applied yale, columbia, Howard for medical.