How to say grade dropped in Mandarin?

♡♡♡Standard Chinese Language Learning♡♡♡ (Mandarin) () 家庭系列（八）成绩下降 A: Érzi, nǐ zhècì kǎoshì chéngjì xiàjiàng le hěn duō, qiān wàn bùyào zài tānwán le. A：儿子，你这次考试成绩下降了很多，千万不要再贪玩了。 A: My son, you grade dropped a lot in this exam. Do not play so much please. B: Hǎole hǎole, zhīdaole. B：好了好了，知道了。 B: Okay okay, I know. 普通話 普通话 中文 汉语 Hanyu Online Mandarin Online Chinese Study Mandarin Study Chinese Putonghua e-Putonghua