School options

Hi everyone wanted to know please your opinions on rvis and Nadeen School. I have a 7 and a 4 year old. We're new in Bahrain from Montreal. Nadeen has a spot for my eldest but not the young one and rvis has a spot for both.
These are my two options for school at the moment because there aren't any spaces in St Chris and BSb.

I am not familiar with the British curriculum.
iS it anything like the American? Stem based?
My kids will eventually go back to Canada so want to create minimal confusion. Our Canadian curriculum is similar to the American a bit.

Your opinions would be very helpful.
Thanks in advance

I would go for RVIS since both of them can go there. Nadeen is good as well but since they only got one spot.. I have heard nothing but good things about RVIS.