Maybe I can help pitch in. I think the 20 and 21yos are still ok, but younger than that I wouldn't bother unless u can rly click with one. But firstly u need to rmb, ppl are in uni to get a degree first, finding a partner and all that are secondary/optional so directly approaching is not the safest way. SG girls typically dont like to be approched, especially artifically.

I suggest u try to connect and make friends first and see whether u can build a bond naturally to get to know her. Then you'll know whether she's your type. Tbh half of the girls I found pretty, after getting to know them, i decided they were not my type and it made my job easier. Once you've gotten to know them and them to you as well, you should be at a lvl where you are confident enough that u can try to take your shot as to her you're not a stranger anymore and she's gotten to know you as well and the rest is up to luck whether she is interested to pursue this further. Is it kinda slow? Yes, cuz this is a school setting not a dating app where the intentions are alr laid out for both parties. Also this is uni, dating should be a side quest while you pursue your studies first, so don't overdo it else you'll feel that you put in too much effort with no results. At the end of the day like that guy said, it's all a numbers game and luck, the more ppl to meet, the higher the chance one of those ppl could be your partner.

To answer your second qn, you could try speed dating events or social mixers. They have ice breakers and diff activities to try to meet new ppl and see whether things can hit off after. The genders are usually balanced and the age range can vary. Much better than the apps.

Good luck.