You may try, but don't get your hopes up...
I had a K3 student last year whose parents tried to get him into La Salle. That boy has every and I mean every certificate that any child can have at his age. E.g. at the age of 6, he had passed the Cambridge Movers exam, which is actually designed for P3/P4 students! Plus many others, it's incredible. BUT my point is, La Salle nevertheless rejected his application multiple times. His parents asked me to go over the application letters over and over again, just to make sure there are no grammatical, structural and vocab. mistakes. They even asked the kindergarten's principal to personally go and drop off the application documents! Everything in vain.
Sometimes, I have a feeling that international schools don't care too much about all those formal qualifications, but more about the child's personality (i.e. flexibility, sharing, etc.). Just a thought...