Answer:
These are symptoms of a migraine or low blood sugar. I would say that he needs to take a break and try to increase glucose levels by eating 15 grams of fast-acting carbohydrates, such as hard candy, honey, syrup, fruit juice, or sugar. Then wait about 10-20 minutes before getting back to studying. Also to try to limit his study time, because studying for to long and being stressed is most likely what caused this.
Step-by-step explanation:
Hope it helps! =D