复
读
About
The word 复读 is formed by combining the character 复, meaning "again" or "repeat", with 读, meaning "to read" or "to study", resulting in a literal sense of "to read again", which specifically denotes the action of repeating a year of study or retaking an exam in educational contexts.
Word Definition - 复读
to return to the same school and repeat a course from which one has already graduated, as a result of failing to get good enough results to progress to one's desired higher-level school; (of an audio device) to repeat a recorded phrase (e.g. for language learning)