You've gotten over the first hurdle, which is getting in to the campus of your choice, and in any case, you'll have a plethora of options ahead of you. Here's what you should do for each specific case:
1. Degree Program With Available Slot
In simpler words: "You made it into this campus, but you didn't score high enough in the UPCAT for any of your course choices"
What you can do: Wait. Research possible course options.
Possible outcomes: UP does not have the highest of applicant yields, and you can expect that a good number of accepted students will go to other colleges for various reasons, thus clearing up spaces in many courses for you.
While this is good, since you will probably end up with your first choice course if you're ranked highly enough, it's worse than a Waitlist in the sense that you're not first priority, and that you could still end up with a course somebody else didn't want, rather than one you wanted.
In simpler words: "You've made it, but we're missing some document in your application."
What you can do: Wait for the UP Admissions Office to open after the break, then call them up to inquire about what documents you still need to submit or what you still need to clarify. Usually it's just the former.
Possible Outcomes: Most of the time, this results in an outright acceptance. Applicants usually just need to submit something like a birth certificate, or high school records and they're done. While these aren't reasons to panic, neither are they reasons to celebrate, yet.
In simpler words: "You're good enough for a campus and a course, but just fell a bit short in comparison to other applicants."
What you can do: Wait.
Possible Outcomes: Just like with DPWAS, you shouldn't worry because of UP's applicant yield. A lot of students will opt to go to another college and will probably open up slots for you in your course. It all just depends on how high up you are on the waiting list, so if you did well in the UPCAT, you shouldn't worry.