LIZS advice is brilliant! I sure wish I had asked before we spent a fortune on this really poor International School...
This particular school does follow the PYP (Primary Years Program for IB) which seems to amount to not an awful lot of learning. I would be really worried for any child that does not do many hours of extra work (particularly in maths) that had to return to the UK school system at some point.
The teacher turn-over is a HUGE issue. Here in Austria there is a really strong union and once a teacher has been in the school for 3 years they are considered permanent staff so rather than risk having too many teachers that are on permanent contract, the school tends to let them go after 3 years...
Children do come and go all year. This can be really hard for your child if you are there long term.
ESL children get more time and attention (deservedly so) but that can mean that native speakers are not challenged enough.
Learning support or Enrichment Programs seem few and far between so worth asking about if your child might need either.
Our school seems to know that they have a 'captive audience' since there are not many options for educating your children in English so it doesn't seem as though it is a 'private school' although it sure is pricey!
I am not sure who monitored the school this year but they didn't seem to notice that the work outside one of the grade four classrooms has been there since September so certainly does not include anything by the newer students!!!
Look closely at the facilities At our children's school the playground seems designed to accommodate 40 children but actually has up to 400! The library is rarely open after school and the cafeteria closes 1/2 hour after the school day ends making it a real challenge for parents with younger siblings to wait for after school activities to end
Leadership turnover is a real issue here too. The Head, Deputy Head and the Director in primary are all new this year.
Sorry for the ramble/novel.
I am really trying to find one positive thing to say but nothing springs to mind...except that the High School is supposed to be better!