I hear from my former Sunday school students that there's been a recent (stronger) push to improve the academic reputation at CDNIS and their facilities are pretty amazing, especially their music program. I should also add that all my former Sunday school students from CDNIS are incredibly well adjusted, so I do think very well of the school. My son goes to PY1 at SIS, as we were looking more for a strong English and Mandarin program, although we do speak a mixture of languages (English, Mandarin and Cantonese) at home, too as my husband's from HK/Singapore and I'm from the States. Our son loves it there and thinks it's loads of fun. No exams yet and as they're doing the IB there now, I don't think the exam schedule will be the same as what they have in Singapore. It's definitely more ethnically Chinese, including Eurasians, but I suppose that the bilingual curriculum plays a big part in that. We figure that he gets to socialize plenty with locals/foreigners in different languages at home, church, playgroups and other activities. Hope this helps!