For collection of data, the most useful tool named “test” was used and to determine the content of the test, available literature pertaining to mental abilities and mental assessment was examined. After examining the related literature and model of Bennett, the researcher prepared an aptitude test to test the aptitude of the students of 10th class in the subject of Mathematics. During the construction of the multiple choice items of the test mental level of the students and their texts were seriously considered. Army aptitude tests were also studied. The researcher initially developed 120 test items under three sections (Arithmetic, Algebra and Geometry). The items were 50, 35 and 35 from Arithmetic’s, Algebra and Geometry respectively. There were five options in each item.