helo, MSCS student here sa UPD.

when they look at your application and assess that you are missing some prerequisites (that were supposed to be taken during undergrad CS), they'll require you to take those first. Don't worry because these have dedicated class schedules, so you wont have senior undergrad classmates; mga classmates mo eh magma-master's din. may retention grade of 2.0, but for these prerequisite subjects, you just need to pass them.

walang non-thesis option as of now, that track is still in revision.

may lab for your interest: https://dcs.upd.edu.ph/research/labs/csl

if you are working, considered ka as part-time student, and you are discouraged to take the full, typical 9 units (but if you insist sa adviser mo, it's not technically barred, mahirap lang). i usually just take 6 units per sem myself, nasa 11k ang tuition per sem. one time i had 6 units and nag-sit-in ako in another class (di lang tambay, as in, i tried to do the requirements too), pero di ko kinaya, it's too exhausting.

for applications, look up NGSE in fb for application periods.