Things you (not your son) need to do
1° figure out your official EFC. Be seated when you do it because it’s likely to be a shock, unless you make less than 75K a year (or at least less than 150k at some top private colleges). Compare that number with what you can afford. Most colleges will expect you to spend about 30% of your income on college costs.
If your EFC is zero or very low your son may be eligible for special programs such as Posse or Questbridge that offer excellent scholarships.
2° run the NPC on a variety of colleges: your instate* flagships and other public universities instate, private colleges in the state, but also colleges such as St Olaf, Macalester, Grinnell, Vassar, Connecticut College, Beloit, Dickinson, Muhlenberg, Whitman, Pomona, Brandeis, Marist, Drake, Providence, Northeastern, Creighton, and even Notre Dame, Brown, or UPenn. Look at the results. You’ll quickly notice differences.
Now run the NPC on the state universities you’ve listed so far. Figure out what costs are acceptable and what costs aren’t acceptable to you. Don’t let your son look into unaffordable colleges.
3° * Figure out what’s instate = where YOU pay taxes+have a permanent residence + have a driving licence/vote.
If you need to establish residency because you don’t have one, now’s the time since it’ll have to be registered as more than 12 months before he starts college.
I agree that 1400 is excellent for a top French student. French students do quite poorly on standardized tests because they’ve been trained in writing long essays, not answering many multiple choice questions quickly. However, many colleges will be going “test optional” in the Fall, including many excellent colleges. In that, he’s very lucky 
because colleges will use rigor (IB = maximum rigor), GPA (unweighted), essays, activities, recommendations.
If they use class rank, usually they want to see top 10%. That’s it. (HS students may care about top 3% v. top 6% but it’s like chocolate medals invented for HS kids. It doesn’t matter to colleges and more than once you’ll find that the top ranked students don’t get into their college of choice whereas other students in the top 10% do.)