Class rank

What does a class rank mean to colleges? I am in my junior year of HS and my class rank is 11/610 here in NM. I will be transferring to CA HS to finish my senior year. I may be in a lower class rank in one HS over the other in CA. How should I choose my HS?

More specifically if someone knows about Mission San Jose High compare to Milpitas High, what good and bad, and how class rank will affect my application to UCs.

UC’s do not consider class rank except for ELC eligibility. ELC eligibility is for the top 9% of HS students in their HS or in the state, which guarantees (if room is available) that if you are not accepted into a UC of your choice, that you will be offered a spot at another UC (UC Merced). Pick the HS which best offers the classes you are interested in taking, where you think you can excel and feel you would enjoy your Senior year in HS.
This should have been posted in High school life, not in the UC transfer thread.