A recent study suggested that taking a bottle of water into the exam hall could help students improve their grades. According to the study those who brought drinks, 71 (especial) water, with them when sitting their exams performed up to 10 percent better than those who did not. Comparing their exam results with their normal schoolwork grades, scientists then found that all those who 72 (bring) drinks with them got better grades 73 between 2 and 10 percent. It is unclear 74 drinking water improves exam results. But scientists say having