There is a biweekly magazine called "Star", which has comprehensive list and introduction of international schools in SH (such as curriculum, Number of students, Teacher-student ratio, After-school acivities, and Contacts). You can free take it from international schools and some compound's club house, or maybe Starbucks.
This magazine has weblink, but for some reason I can not access it.
http://www.internationalschool.info/littlestar