I have this friend, he is from the Czech Republic, Europe. He want´s to study at Yale/Princeton/Dartmouth, he is a perfect student with the best English ever (you would say he´s British). Are IB tests enough, or does he have to do any other tests? Thanks :)

Have him check out the websites of the different schools he is interested in. They all have sections for international students who want to apply and what criteria will be needed.

He probabbly didn't think of that... neither did I...

I think the IB test would only be good as a School report he would have to take an ACT or SAT test on top of that (he can register for a December test If it's not to late.)

I am a fellow IB grad, and I thought that 9 IB exam grades would be enough, but to be honest, IB is not taken as seriously in american universities as it is in other countries. He may be better off taking AP exams (they're much easier than IB exams), and getting some really good recommendations.