3 sentences

1. 他因为考试不及格被妈妈训了一顿。

   tā yīn​wèi kǎo​shì bù jí​gé bèi mā​ma xùn le yī dùn.

   He was scolded by his mother for failing the exam.

   Source: Dong Chinese Dictionary

2. 他整晚提心吊胆，生怕自己考试不及格。

   tā zhěng wǎn tí​xīn​diào​dǎn, shēng​pà zì​jǐ kǎo​shì bù jí​gé.

   He was on edge all night, for fear that he would fail the exam.

   Source: Dong Chinese Dictionary

3. 学生中流传着一个传言，说这位老师会让所有学生考试不及格。

   xué​sheng zhōng liú​chuán zhe yī gè chuán​yán, shuō zhè wèi lǎo​shī huì ràng suǒ​yǒu xué​sheng kǎo​shì bù jí​gé.

   Among the students there's a rumor that this teacher fails everyone on their exams.

   Source: Tatoeba