The schools don't only look at SSAT and TOEFL scores. They will also look at school grades, teacher recommendations, essays, extracurricular activities, parent statements, etc.
Very good high schools, as in PEA, Milton, Andover, the students needs 100 TOEFL minimum and the SSAT should be around 90% .
However, the schools will also look at school grades, teacher recommendations, interviews and extracurricular activities, not only the scores.