How considerate are colleges about competitive high schools/harder curriculums in Asian countries?

Can you pay? Then you will find a decent college to attend here.

If you need financial aid, your situation is weakened. But, it depends on a few factors. If you need some financial aid, you have a shot at a number of very respectable schools. If you need full financial aid, as in you can’t afford anything at all, it is highly unlikely.

Here is a list of colleges that provide financial aid to international students:

Of that list, only seven colleges provide 100% fiancial aid.
They are Harvard, Amherst, Yale, Princeton, MIT, Dartmouth, and Bowdoin. They will accept the very best of the best, in terms of both academics and extracurricular activities.

Because you have stated you are in the middle of your class, I believe you have no chance at the schools I just named. However, the link provided includes some of the best colleges and universities in the nation. I am sure that many of those colleges, given your school’s rigor, would be thrilled to accept you.

And as mentioned, if you are full pay, you will have many acceptances, I am sure.