I'm Beat

After three hours of trying to get Jack to do homework I fell, defeated, beat, nothing left.  At the end I was reading him the multiplication problem and helping him figure out the answer and then I was writing it down for him.  Where is that ultimately going to get him?  Nowhere, fast.  I was presenting a problem, helping him find the answer and then two questions later was asking the same question over.  He would have no recollection of what the answer was.  I was beaten at that point.  My efforts were in vein and I had no more energy or time to give.  I don't know how to do it?  I cannot give Jack all of my time every evening just to do the work myself.  I have two other kids who need some of my attention as well.  This was day three of homework like this and somethings got to give.  I don't have it.  I will seek divine intervention.  What else can I do?