Considering the importance of academic achievement for students, parents, teachers and the community, finding the appropriate and right techniques to prevent low academic achievement is indispensable. Based on the result of this study, depression and test-anxiety have the relationship with low academic achievement among high school students. In other words, students who have depression and test-anxiety are likely to drop out from school. Hence, methods of controlling depression and test-anxiety must be devised in order to reduce the students’ dropout rate and increase their academic achievement. The findings from the present study reveal that students with test-anxiety and depression have low academic performance. Thus, it is recommended that the Iranian Ministry of Education support and encourage the establishment of counseling centers in high schools, where counselors and clinical psychologists can help students to treat mental and academic problems. Also, it is suggested that the Ministry of Education should encourage workshops and seminars to guide students on study techniques in order to motivate and increase their ability to control test-anxiety and depression.