Getting him tested is a good idea. You may be able to try for the Davidson Young Scholar program with a great support network after that. Otherwise too, it is better to know what you have in hand and have some professional advice. I just came across a blog today which is by someone like us. He has started this few days back and in the blog of his daily schedule, he is providing good content on the struggle, schedule, syllabus, etc. Just thought of sharing.So you really don't need to know where to start. There are lot of avenues and let the child lead :-)
http://gradeless.blogspot.com/2013/10/8-3-2013-friday.html 
