A pre-employment exam enables a given employer to screen for certain qualities they are looking for in their prospective hires, whether physical, mental, knowledge-based, language proficiency, or personality-based. Depending on the nature of the job you are applying to, these tests can make sure that you are physically and mentally fit to endure any challenges that the work presents. In this way, pre-employment exams are helpful for both employers and employees alike, as it can help both the employer and the employee know whether the particular job or field of work is the right fit.