Hi, not sure about the teachers quarrelling though, never heard them. Not sure about whether they have Mandarin lessons too as my son is only pre-nursery. However, during his playgroup time and up till now, I have no complaints about the school and my child is happy to attend school. Now, he even brings home a file every Friday from school and in this file, shows me what he has done for the week and some additional homework for him to do over the weekend for parent and child bonding. But I think its still up to the individual to decide, what is best for your child.