Thanks to you, I passed! I failed the practical exam twice as a non-major and self-study student, so I thought I couldn't go on like this, so I bought the course, and I barely passed with a score of 65 in just 1~2 weeks. I made a few mistakes in practice 1 and 3, but I got a perfect score in practice 2 with LightGBM that the teacher taught me! Thank you!!