I really don't know what to tell him. He asks for me to help him stop cutting. He only cuts when he is upset though, but this month hasn't been his best. (grade wise) (Freshman) and his mom treats him like a failure because of it

So, Please... I need some advice to give him. \: And I reallyyyy don't want him to be cutting anymore because it hurts me and makes me want to cut tooo \:
~Thank you.