The mother or father could have found a tutor for their son if they were unable to help.
A hair cut and clothing that fits helps in this matter.
Grab that little hoodlum by the scruff of the neck and get his hair cut, darn he looks like a sheep dog. Make him wear clothing that fits not down to his knees and no T Shirts, a shirt with a collar, pants with a belt.
Let that kid know that as his mother is a hairdresser he will be tied up and hair cut ever month until he gets his grades up, no earrings or face piercings, they have to earned with a B at least in 3 subjects. Hair is not to be anyway longer then 2 inches until he puts some effort into school. No bandannas or ball caps or other gang related symbols.
I missed the age of this Punk but curfew of 6 PM school nights and 9 pm. weekends ----
I see why now back in the old days people would lock up problem relitives in the attic.