Start all over again.

It means to strengthen basic knowledge, supplement what you are not good at, and start over.

Sentence is the basic unit of language use. It is composed of words and phrases (phrases). It can express a complete meaning, such as telling someone something, raising a question, expressing a request or stopping, expressing something. A kind of emotion, expressing the continuation or omission of a paragraph. There are relatively large pauses between sentences and sentences. It should end with a period, question mark, ellipsis, or exclamation point.