Do the best you can. You don't have to do it perfectly. If you are going to do carbs, do clean ones like white rice and potatoes, corn tortillas, sweet potatoes. Organic if you can. With lots of butter, aged cheese and other healthy fats. Kids need more carbs and generally enjoy these. Get as much rest and sleep as you can. I know it is hard.
You didn't mention exercise. Don't worry about it.