There are many reasons why Zachary can't concentrate. He might have something on his mind that is bothering him, he could be hungry, he could not have a lot of energy. The best thing Zachary could do to help the paper not suffer is leave his desk and paper alone for about a half an hour, and maybe eat something, or just take a break. Maybe take a nap to get some energy back up so that he can get everything he needs in his paper.
Tell the man to take a break and to eat or read a book. Don't go on any devices because it will distract him and cause more stress. He needs to tell himself that sometimes it's good to take a break and he already has amazing grades.
