"Hard" is a relative term. What seems difficult to one person, might not be difficult to another. Each belt rank advancement in Taekwondo should be gradually more challenging than the previous, but the training in between tests should prepare a student to be able to accomplish anything required to pass the test, and be promoted. Of course it is hard to a certain degree. If it were easy, it would not be an accomplishment nor worthy of any special recognition.
If passing a test to the next belt level proves to be too hard, then there is a problem. Either the student is not putting forth the effort needed, or the Instructor is not doing his/her job to adequately prepare the student. In some cases, students might have individual learning challenges that prevent them from advancing at the same rate as others. Go at your own pace, but remain dedicated to success.
Advancement in Taekwondo is not a race, and one student's progress should not be compared to another's. It is an individual journey, and each student will reach their next goal in their own time. It is up to the Instructor to make sure that the student is not overwhelmed and pushed too hard, nor allowed to stagnate or procrastinate. It is up to the student to attend class regularly, train diligently at home, and always do their very best, and never quit!
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