3 sentences

1. 他最近正埋头准备研究生考试。

   tā zuì​jìn zhèng mái​tóu zhǔn​bèi yán​jiū​shēng kǎo​shì.

   He has been immersing himself in preparing for the postgraduate entrance exam lately.

   Source: Dong Chinese Dictionary

2. 他决定大学毕业后继续读研究生。

   tā jué​dìng dà​xué bì​yè hòu jì​xù dú yán​jiū​shēng.

   He decided to go to graduate school after graduating from university.

   Source: Dong Chinese Dictionary

3. 他在工作之余报考了在职研究生。

   tā zài gōng​zuò zhī yú bào​kǎo le zài​zhí yán​jiū​shēng.

   He applied for a part-time postgraduate program in his spare time.

   Source: Dong Chinese Dictionary