ISF or SIS

Got the ISF K offer and SIS PY offer both.

Being optimistic about ISF' prospects, but there will be no guarantee for ISF academy (only 85% preschool students have the chance)

If we choose SIS, a bit worry about the Chinese level of the kid. Besides, the IB result of SIS seems weaker than ISF.

Anyonecan give us some idea Many thanks!