What Drink is Best Before an Exam? The Ultimate Guide
                                
                                
                                •
                                
                                
                        
                                    
                                    5 min read                                
                            
                                Mild dehydration can reduce cognitive performance and impair memory, with one study of university students showing that those who drank water during an exam performed on average 5% better. This makes the question of what drink is best before an exam a crucial consideration for any student seeking to maximize their potential.