This study examined the reliability and difficult indices of Multiple Choice (MC) and True or False (TF) types of objective test items in a Mathematics Achievement Test (MAT). The instruments used were two variants- 50-items Mathematics achievement test based on the multiple choice and true or false test formats. A total of five hundred (500) students randomly selected from ten senior secondary schools in five Local Government Areas of Akure, Ondo State served as sample for the study. The results of the null hypotheses tested at p = 0.05 showed that there was no significant difference between the reliability coefficients of MC and TF test items. Also, there was no significant difference between the difficult indices of MC and TF test items. Hence, it was recommended that a combination of both MC and TF types of tests should be used to evaluate students' achievement in schools. (Contains 3 tables.)