Top schools know that getting a 1.0 is exceptional. So, you’ll make the first cut. Then comes the second cut.
Universities might somewhat take into account whether a student comes from an essay-based curriculum (France, Germany, Italy…) or a standardized-test-based curriculum (South Korea, China, Japan) - after years getting applications from all over the world, they know what’s “normal” and what’s “average” for your country. But the key criterion is that, of course, they want to know whether English is a first language. They’ll cut you a bit of slack there - of course, taking the tests in a foreign language is harder than in your first language (and since the tests do not in any way resemble a college test, they don’t really indicate whether you are bilingual or not). Finally, it’s not so much the curriculum is recognized (because gaokao is recognized, JEET is recognized…), it’s whether 1° there’s a national exam board and 2° there’s corruption or widespread cheating at any point in the exam process.
Overall, though, you have to be within range both for your region and for the university overall.
30 is top 10%. So, that’s good. But for the Ivy League, you need to be top 2% at least.
For the Ivy League and equivalent, 32 is bottom 25%. So, for an international, 32 is okay if English isn’t your first language, 31possibly if something makes up for it in your application. 30 is unlikely to be sufficient, UNLESS you have something extraordinary (ie., national award winner, international competition-level athlete, published writer, recorded musician…)