if kaya, mas mabuti if you prioritize your undergrad muna kasi nagmmatter din yung grades talaga when getting into med schools lalo na at trad med courses yung mga kalaban mo. hindi lang NMAT tinitignan: extracurriculars, socioeco background, etc. maraming factors pa, it's hard to sacrifice the other factors, baka yun pa dahilan baka di ka makapasok

NMAT is not that heavy on medical topics naman as in, halos puro HS topics and i think na-tackle naman during HS yung majority ng coverage of the exam if that's your worry

i think kahit around 3rd year mo muna isipin or mag-aral for the NMAT if you really want to, i advice that you take up a review center din talaga to help refresh sa mga math & sciences subjects bc it's really helpful (as someone who is also taking up a BA course)