[UPD] courses outside curric just because

im curious if it's possible to take courses outside my curriculum without the intention of shifting and just because i want to take extra classes for the hell of it (i love learning lmao)

i've seen posts abt it pero mukhang lahat ng reason is to prepare for shifting tapos may nabanggit pa na u need to talk to your adviser for them to approve (correct me if im wrong)