If you target TSL, you still need to study Chinese. If YCMA does not teach Chinese, though you may not need extra English Courses, but you still need to extra Chinese Courses. Bear in mind, Chinese is more difficult to learn than English.
what's the monthly fee in YMCA?
It's difficult to find a good center to teach Chinese unless you've time to teach by yourself.
My friend's son studied in SC & entered DBSPSD, he still needed to pay efforts in catching up the Chinese. So if no Chinese teaching in YMCA, you \ someone need to teach it in order to catch up the primary curriculum.