umm lol ill try my best to answer these questions. :P
1) you can’t be on the road and do IB. unless you have tutors to document your hours. because IB requires each class to have a certain amount of hours thats why you’re not allowed to miss that much school as it threatens your chances of getting a diploma.
2) if you get your diploma and take a gap year or whatever. you still have to be a freshmen. you can only get collage credit for some classes depending on the university. however in england you can apply for 2nd year entry, but then you’ll need a higher IB grade for them to allow this.
hope this helps. :P