<p>As a legal permanent resident, he is considered a US applicant for admission and financial aid. If he becomes a National Merit Semi-Finalist because of his PSAT score, he will need to affirm that he intends to apply for citizenship as soon as he is able to do so in order to be eligible for consideration as a National Merit Finalist. There are some private scholarships that are only for citizens. However there aren’t enough of them to make it worth worrying over.</p>
<p>Do read through the citizenship application paperwork. It may be cheaper to do it while your son is still a minor.</p>