Interview tests, or pre-employment assessments, are evaluations that companies use to review their candidates before they're invited to a formal interview. Interview tests help companies determine which candidates have the necessary skills for the job and should be invited for a job interview.
An exam is a part (sometimes a significant part) of your grade, but only a part. An interview is trying, within an hour, to evaluate a candidate's ability to be a useful and productive member of a team.