What are my chances of getting into UP?

The UPCAT is a really easy one compared to ACET. But the chances of getting into UP is more difficult because of the many students who are also taking it. I suggest you do good in picking your courses. Do not try to choose courses that have quotas--the one with limited number of students--and instead go for a course that you think has less student applicants. Once you get in, try shifting to the course you are really interested in. Anyway, goodluck!