Drink at least 8 glasses of water

Approximately 70% of our bodies are made up of water and over 80% of our brains are water. Not enough water can lead to dehydration, which causes headaches, lack of concentration and focus and tiredness.
Drinking at least eight glasses of water a day is important for health and success. Keep a water bottle beside you when you study and take water into the exam with you if you are allowed.