You might look at the Common Data Sets for the schools that you have listed, and specifically in Section C7 of CDS, which tells how different academic and non-academic factors are weighted by the respective schools. For example, some schools weigh test scores more than GPA, or vice versa; or they may give equal weight to test scores and GPS. If any of the schools give more weight to test scores, then perhaps focus on those (unless there is a good explanation that your son could give about the variance between his test scores and his grades).
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