How hard would it be to shift from philo to applied math? Any tips?

So I chose philo as my prio course on my application but i realized after ive taken the test that i probably have better job prospects if i graduate as a math major. And long story short Ive come to realize that i like math more than philosophy, and philo being one of the core subjects in ateneo would be enough to scratch my philo itch HAHA. Also i read on a post here cant remember which exactly that its pretty hard to shift from humanities to stem and vice versa in ateneo (can somebody confirm that?) and i think the fact that i’d be shifting to an honors course (pag pumasa) would make this even harder.

So i guess what im asking here is for yall to tell me things to ground my expectations and maybe provide some tips if you have any. Rest assured I’ll be reading more on the process.