2 sentences

1. 他正在准备考大学。

   tā zhèng​zài zhǔn​bèi kǎo dà​xué.

   He is preparing for the college entrance exam.

   Source: Dong Chinese Dictionary

2. 学生们正忙着准备考试。

   xué​sheng men zhèng máng zhe zhǔn​bèi kǎo​shì.

   The students are busy preparing for the test.

   Source: Tatoeba