I heard from my classmates that if you want to find a job in some companies, you have to take an exam before you interview (Wenzhou)

In fact, they are all interview processes, and some companies have long processes, such as resume, written test (initial test, retest), interview and offer. Some specific strategies can refer to large websites such as ChinaHR.com or Zhaopin.com, or BBS for campus recruitment, or communicate with counselors or brothers and sisters.