12 year old being bullied

My 12 yr old is going through the asd assesssment, my older son has aspergers.. my problem is my 12 yr old literally cant get on with any of his peers. He comes out of school most days cause the other boys are picking on him. He struggles with school so much but the school are no help i have been in a load of times to no avail, i feel so helpless to help him i dont no what to do. He doesnt have 1 friend at all. He never leaves the house ethier just to go to school.. any advice will be greatly appreciated thx u for reading