My child complained about being bullied at school. I feel like complaining to the school but I am good friends with those kid's mums and do not know how will they react or do I talk to them directly?

bullying is a very serious issue that can have long lasting negative impacts on the child that you may not even be able to see initially. whether you are friends with the mom or not is irrelevant here, your child's safety and overall health is always more important. please make sure you bring this up with the school and give out a clear message that you will not tolerate any of this, and teach your child to speak up as well. take a look at this article, it may help https://www.theindusparent.com/yes-bullying-indian-schools-exist-heres-can