<p>My son prep school also uses a 6-point scale too. NO kid ever scored a perfect 6.0 ever. But here I see many kids with perfect 4.0 grades, yet their subjects SAT II as well SAT 1 are lower. My son attended a very prestigious public school. He was in top 2-3 kids but here in prep school he has never got anywhere near 4.0. Had he remained in his public school, he would have 4.0 but with his current prep school GPA. He is finding that almost 50 kids in the previous public school have a higher GPA than his current prep school GPA of 5.3. Thus, I think his SAT 1 and SAT II scores reflect that he does not have a lower GPA if the grading criterion is same. Thus, I think SAT 1 and SAT II has relevant for him to compare with other kids. Others may find that they have bias for them.</p>