Lǎoshī shuō tā hàodòng, shàngkè hěn nán jízhōng zhùyìlì.
The teacher said he is fidgety and has difficulty concentrating in class.
Tips
usage
好动 (hàodòng) uses the 好 meaning 'to be fond of / prone to' (4th tone), not 'good' (3rd tone). This 好 appears in many words: 好奇 (curious), 好胜 (competitive), 好学 (studious).