Chance me for Engineering School/2nd Choice Polytechnic Institute

My son noticed on his application portal under scholarships that his GPA was recalculated to be unweighted and is also calculated differently than his school calculates unweighted GPA. At his HS an A and A- equals 4 and the way this was calculated an A = 4 and an A- = 3.7. He has quite a few A-'s so hopefully it doesn’t hurt his chances too much.