Cpt Doc
On the application form..when you go to your profile on jobs applied,you can go down to where it reads certificate and under the space with grades..type in (English-Grade,Maths-Grade,Physics-Grade) then also write Average Mean Grade..that should sort out your application..
Don't be worried,if you have met the minimum requirements and you went through the steps properly,they will call you and verify as the process continues about the grades..all the best..