Formal:
* 考试顺利 (kǎoshì shùnlì): This literally means "smooth test" and is a common and polite way to wish someone good luck on an exam.
* 祝您考试成功 (zhù nín kǎoshì chénggōng): This means "wish you success on your exam" and is a more formal and respectful way to express good luck.
Informal:
* 加油 (jiāyóu): This literally means "add oil," and it's a common way to encourage someone to do their best. It's a versatile phrase that can be used for many situations, including exams.
* 考好 (kǎo hǎo): This means "take the exam well" and is a simple and direct way to wish someone good luck.
* 一切顺利 (yīqiè shùnlì): This means "everything goes smoothly" and is a general way to wish someone good luck in any endeavor.
Other options:
* 祝你考试顺利 (zhù nǐ kǎoshì shùnlì): This is a more informal version of "考试顺利."
* 考好点 (kǎo hǎo diǎn): This means "take the exam a little better" and is a more casual way to wish someone good luck.
The best way to say "good luck on your test" in Chinese will depend on your relationship with the person and the situation.