My daughter is in MindChamps Toa Payoh in N2, and like you, I had the same concerns before enrolling her in. So, I went down to talk to the principal and teachers who will be taking care of her class to understand how they handle the care of the kids, and any standard procedures applied. We have a 2-week trial period to see if our child can adapt to the school environment and whether the school is suitable for our needs.
Perhaps you can call to fix a date to visit the centre, and talk to the principal and teachers who will be taking care of your daughter?
I think the curriculum is great too, and I've seen changes in my daughter since she started early this year
All the best