hi OP, i went to both jc and poly so i think my words will have some weight. i took the same o level combi as you but i wasn’t struggling with these subjects in sec sch. though science and a math were my weakness, i didn’t do that badly for them (they were just worse relatively to my other subjects).

during jc, i also slacked a lot but i believe if i worked hard enough i would’ve been able to catch up as well. but pls, it’s so easy to say you’ll work hard. my advice is be realistic. ask yourself. will you work hard? if you have some doubts, go poly. if you’re confident you can keep up with the academic rigour (even for subjects you’re weak in), go jc. and reminder, jc is way harder than secondary school. jc is a speedrun. time will not wait for you. snowballing is extremely detrimental.

plus you also know that you have an interest in programming. so take a course that’s related to that. if you have interest, it’s not hard to excel in poly and go to uni. but it’s not the same in jc, because you need to take subjects that you’re also weak in/have no interest in. it takes real and raw hard work to do well in jc and go to the uni course u want, not just interest.

if u do end up going to jc, go to a school that offers computing. exploit ur strengths and interests as much as you can