If you fear to suffer dehydration and find yourself unable to study because of extreme heat during the day you may skip the fast as long as you make up for it later.

 

However, you are not merely allowed to skip fasts just because you think you feel hungry. The very purpose of the institution of fasting is to train us to endure hunger and thirst. It serves to remind us of what the poor go through every day of their lives; it also conditions us to learn self-restraint. So no one is allowed to skip the fasts for flimsy reasons of fear of hunger.

 

Almighty Allah knows best.