Education (Durban)

Good morning
Anyone there who can answer my questions! .
We will be moving to Durban very soon so I have lots of questions. The most important now is related with school. I have two daughters , ages 7 and 8. I am trying to understand the South African school system in comparison with the UK. My daughters have been educated in the British system and I need to understand the ages and school years in South Africa where they should be placed.
I have been looking for info about school so far Durban girls school and Crawford.
Your help with be valuable
Thanks a lot