CAIS

My son is currently studied in local school. My husband and I are thinking to send him to international school. Right now we have narrowed down our choice to 2 schools and one of them is CAIS.
Can parents please kindly share more on the school
Workload and assessment?
Any other fees except tuition fee? e.g. tour? extra-curricular activities?
Do we have to pay the debenture?

Are the kids happy in school? How's their discipline? How's their academic standard?

Thanks in advance!!!