Kids are driving wife insane

My kids (8/8/4) are driving my wife insane. She is a SAHM and every school day they act like it is the first day of school and dont know the routine we've been doing for the past 4 months. And they will not follow simple directions like to sit in their seat during dropoff, and instead are wrestling on the floor in the van while in the dropoff line. We just dont know what to do to get them to do what they need to do without having to tell them 20 times. Is this just 8 or can we improve this somehow?