Here in Canada, a high school diploma or GED is required to enroll in universities and colleges. They will make zero exceptions whatsoever. I’m afraid I don’t know what an IB diploma is, so I cannot advise you about it. I do recommend you talk to your school counselor about this issue – they know SO much about these things and really are there to help you out. And just to let you know, here in Canada you can get a GED, General Education Degree, which is equivalent to high school. You can get this anytime after you’ve left high school for a year. It is a bunch of tests that grades you on English, Mathematics, Science, etc. It’s not promoted a lot, but it does exist.