Exchange for a trimester to Europe to a highschool for the gifted?

<p>I am looking for an opportunity to enable a school exchange to the US for my son (9th class; special school for gifted children).
The exchange would be for a trimester (three months: ie April to June).</p>

<p>Do you know of selective highschools supporting student exchanges?</p>

<p>Thanks
Joska</p>