NIS Year 2

My daughter is currently studying at an international kindergarten K3. Im looking for international primary options for her. I realize she learns and concentrates better in smaller class environment and during the school research I came across NIS.
Can any moms here share with me:
1) Chance of getting into NIS Yr2 (as I guess most students from NIS kinder will follow through to primary too)
2) class size for year 1/2 in NIS
3) where will NIS students go for secondary schools

Would appreciate any of your comments. Thanks a lot!