Subject + 考试
考试 (kǎoshì) means "to take an exam" when used as a verb, and "an exam" when used as a noun. It is one of the most common words in academic contexts. You can say 参加考试 (participate in an exam) or simply 考试 to mean "to take a test."
明天要考试,我今晚得好好复习。
Míngtiān yào kǎoshì, wǒ jīnwǎn děi hǎohāo fùxí.
There's an exam tomorrow, so I need to review well tonight.
她每次考试都能拿第一名。
Tā měi cì kǎoshì dōu néng ná dìyī míng.
She gets first place on every exam.
下周我们有一场数学考试。
Xià zhōu wǒmen yǒu yì chǎng shùxué kǎoshì.
We have a math exam next week.