<p>As an American (who will be paying international fees) your son will have a good chance of getting into programmes in the UK. Edinburgh will not be unlikely for him. Requirements are usually lower for international students, just because they pay more money, and the uni is more flexible if you miss your offer. </p>
<p>I’d definitely email Edinburgh/St Andrews/any other UK universities and explain about the courses your son is taking. Honours courses will probably be an acceptable substitute for AP courses, though obviously AP courses are standardised and so they’re slightly easier for unis to deal with.</p>
<p>If you’ve got any questions, I’m at Edinburgh currently, and I applied through UCAS to unis in the UK.</p>