The mathematics here is divided into universal, 2u, 3u and 4u.

Generally speaking, it is the domestic first-class and second-class level.

2U is the third-class level in China.

3U and 4U are more difficult, but it is definitely beneficial to choose them, because the more points you get, the greater the difficulty coefficient, and the more points you get.

It will be helpful for your future college entrance examination.

Learning 4U requires learning 3U first.