International student inquiry!

Hi! I'm a 17 year old Filipino student who was born and raised in Singapore. My highest education credential is my GCE 'O' Levels grades. For some context, I failed my maths so it's near impossible for me to enter into any local courses I want in SG.

So my father wants me to pursue my studies at Ateneo instead. I literally don't know anything about the school + I've only been to the Philippines on family vacations. All I know is that it's a good school 😅

I have so many questions but for now, here are the main ones: 1. I read that Ateneo only accepts IB and SAT scores. Are there any outliers? 2. Since I'm 17 and I've already completed my secondary school education, am I eligible for SHS or University? [My dad says I can immediately study for a bachelor's degree. I'm not sure how the education system works in the Philippines.] 3. What's the school culture like? And are there a number of international students?