I suggest you buy the most common kind of hemp rope, which is used in school. When you take the senior high school entrance examination, what you use to take the exam is the most common. If you use it too well at ordinary times, it will hold you back during the senior high school entrance examination. Leading to unsatisfactory results. Anyway, work hard and keep a good attitude. The most important thing is the results of the senior high school entrance examination. There is little difference in sports performance. I wish you success!