Hello, go and get the health certificate this afternoon. In that hot situation, we should pay attention to an empty stomach, not eating or drinking water, but we should pay attention to the physical examination in the morning, because generally speaking, we can't draw blood in the afternoon, but it will have an impact on our health. Pay attention to rest a few days before the exam to avoid physical fatigue, and pay attention to light diet when necessary to avoid spicy and irritating greasy food.