What he could try to do is take ESL classes in Virginia while working (something available to him as a citizen). NOVA has a pretty good “college prep English for internationals” program for instance. If your son works for 12 months before term of entry (ie, if he starts working in June), takes his driver’s license test, registers to vote in Virginia, he will be considered “in-state” and will thus be eligible for Virginia tuition and Virginia scholarships. He will have to apply to many universities (W&M, UVA, VTech are all quite competitive, so he’ll have to apply to some other VA Schools. Fortunately, VA has an excellent university system.) He’ll be able to use his Turkish transcripts (document everything, ask for recommendations from one Humanities teacher and two STEM teachers, show them examples from the MIT advice column - while it’s for MIT, it applies to all selective universities) + test scores from Fall 2017 + ESL class results.
http://admissions.vt.edu/admitted/residency.html
http://mitadmissions.org/apply/prepare/writingrecs