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The purpose of this paper is to describe: 1) number of items in the elementary school mathematics national examination tryout test containing DIF gender and pattern; 2) functionality of differential tests on elementary school mathematics national examination tryout test tool organized by the Pythagoras tutoring institute. This study is a quantitative explorative descriptive study with a type of case research, because it describes the characteristics of the elementary school mathematics national examination tryout tests device and is not generalizable. The amount of data used comes from the answer patterns of 919 students consisting of 431 female students and 488 male students. As for the results of this study are: 1) the elementary school mathematics national examination tryout test kit has a different power ranging from 0.282 to 1,129 and the level of grain difficulty ranges from -3,365 to 2,838; 2) Items in the elementary school mathematics national examination try out test containing 34 items or as much as 87.2%; 3) the elementary school mathematics national examination tryout test kit benefited the female group in theta > -3.06 which was seen from the DTF (differential test function) graph in the male and female groups.