My boy is in N1 of Kornhill International. As far as I know, the kids can study International school or local school after K2 & K3 respectively. I will put my boy in local school, as we have 25 points to his daddy's primary school.
it seems simliar to that in TT, but all the TT students will go to IS primary, so can't be my cup of tea (my kid is attending TT PG and both of us like it so much)!!
i found that the website of Kornhill KG provides not much info (e.g. primary allocation), may be i need to call them for more details.