In fact, whether it is useful or not depends on whether your child is curious. If he has a strong thirst for knowledge, she will do well in the exam even if she doesn't buy him this. If he has no thirst for knowledge, even if you spend thousands of dollars, he will not do well in the exam. Besides, it is very troublesome for huisida to watch this class. He can directly make those lessons into a file set for you, but he insists that you download some software. Personally, I feel that this thing is useless.