My 12 yr old is profoundly bad at math.

It’s reality. My son is terrible at math. I had to pull him out of PS after they wanted to pass him to 6th grade without knowing how to properly write, spell or perform tasks in addition or subtraction. His IQ is considered average but just can’t seem to grasp math. He’s doing well in every other aspect now, thankfully. But math is just not clicking. We are currently studying Math You See and it’s still difficult for him. I as well was never any good in math. Poor kid comes by it honestly. Any advice? Anyone in the same boat? Anyone want to just commiserate?