Don't think too much, you will say that you want to die once you fail the exam. This idea is extremely wrong. And you're ranked 20 out of 34. Who will laugh at you? In fact, grades are not the most important thing in this world, but making money is the last word (it seems too early to tell you this now). But I believe you can tell your father the truth and tell him what to do in the future. He will understand. Remember to find your own problems and correct them later. There is no need to panic when you fail the math exam. If you fail in the middle school entrance examination, you will be in trouble. Therefore, study hard next semester and strive for higher grades.