1. Onion Math's curriculum is completely synchronized with the school's textbooks, and there are a variety of textbooks, including the Renjiao version, the Beishi University version, and the Sujiao version, which can be used by students from different regions. Onion Math focuses on the systematic and depth of mathematical knowledge.
2. Onion Math's video content is interesting and easy to understand, the video is short enough to catch the key points, and the lecture style is conducive to understanding. Euler math is difficult. So onion math is good.