All the schools you have identified are very good schools which generally expect their applicants to score at least 100 on TOFEL and high 2200 in SSAT. However, the test scores are considered in addition to your child's academic grades and other extra curricular activities. Different schools have interest for students with different background and it is good your child is strong in mathematics. You may want to research the school's academic environment to see if they are beneficial for your child.
AP CS
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