TOFEL score of 100 or higher is sort of a benchmark to apply to higher quality highschools. Of course SSAT scores are equally important in addition to your child's school grades and other academic achievements. Interview by vericant are required by many schools
You may be able to schedule individual interviews in person and/or by skype with the schools. Taking more than one SSAT and as early as possible will generally improve your child's results so taking it in November will give you a gauge of how well your child can score. If results are not satisfactory, then retaking in December and January is recommended. http://www.findingschool.net/answers/5356