The study aims to identify the relationship between irrational thoughts and test anxiety among the tenth grade students in the schools of North al Batinah in the Sultanate of Oman. The study population consisted of tenth grade students in three Wilayats of North Al Batinah Governorate (Shinas, Liwa and Al Khabourah), they constitute 1283 male and female students distributed over 8 schools. The researcher used a sample of 546 male and female students. To achieve the objectives of the study, the study followed the descriptive correlative approach. In order to answer the study questions, the study used a scale of irrational ideas prepared by Raihani (1998) and the scale of test anxiety prepared by Abu Arab (2008). The study concluded that the general level of the prevalence of irrational thoughts was high, while the level of test anxiety among the tenth grade students was at the intermediate level. There was a statistically significant correlation at the level of (α ≤ 0.01) among the dimensions of the irrational ideas scale and the dimensions of the test anxiety scale. Moreover, the study showed statistically significant differences in the dimensions of (request for approbation, seeking personal perfection, pessimism of the future, anticipation of disasters, and wishing full solutions) in favor of females. However, the dimensions of (avoiding problems, disturbed by the problems of others, and distinguishing of men) were in favor of males. There were no significant differences between males and females in test anxiety. There were statistically significant differences in the anticipation of disasters in favor of Wilayat Shinas. However, in the dimensions of (avoidance of problems and the sense of helplessness towards the past) were in favor of Liwa. There were statistically significant differences on the social and cognitive mental sides in favor of Shinas. However, the psychological and emotional dimension and the physical side and total of the test anxiety were in favor of Liwa. The study concluded that irrational thoughts predict the level of test anxiety.