Need Giis school syllabus

Hi friends,
this is hema, new to the forum and also will be relocating to singapore in next 6 months with my daughter and son. I want to know what syllabus do Giis school follow cos in their site i see both cbse and cbse-i what the difference?

and another important thing is my daughter ll be finishing her grade 1 on March 2016 from and igcse school but ll be 6 only on May 2016. what class ll be joined wen relocating, into grade 1 again or grade 2?
are they too strict with the age limit. i am sure she ll pass the admission test with ease....