in CBSE schools, IIIrd language is till class VIII.

MES Indian School offers III language Arabic too.

So which class you child is going to join?

If you want to avoid IIIrd language, talk to the Principal and you can send a letter to CBSE, based on the Principal's advice, requesting to permit you child and exempt from IIIrd language.

By the way i am a French teacher in MES Indian school.