<p><a href=“Schools Awarding International Financial Aid”>http://www.internationalstudent.com/schools_awarding_aid/</a> might help you find US schools with financial aid for international students. But those with strong math departments for an advanced-in-math student may be hard to find other than the super-selective schools that have already rejected him. But there may be some schools with cross registration agreements with schools with stronger math departments that may be too selective or which do not offer financial aid to international students.</p>