Career development involves a series of decision-making. Competent decision-making is pertinent to an individual’s career development. During the high school and vocational high school, the students encounter their first and major career decisions in life. A qualified career development test could play an important role in the process of decision-making. Career development test is an important tool to students for career decision-making. It also helps their teachers and parents in providing career counseling. The purpose of this study was to explore the use of career development tests in schools. This study utilized a sequential mixed design with focus-group, content analysis and survey research. The results showed that aptitude test and interest test are used most frequently in all career tests, but there are still limitations and problems in their applications. Based on the findings, some implications were discussed. Finally, suggestions to the construction of career tests were provided. We also provided some suggestions to enhance the effectiveness of counseling and policies.