Abstract: The 2018 education program is currently being implemented in grade 10, built according to he capacity development model. Quest/Conquest software is used for analyzing exams based on modern exam theories. It is grounded on Item Response Theory (IRT). This software provides information about the exam, the questions, students’ ability and the relationship among those factors in the form of texts and graphs. In addition, it also gives quickly and accurately analysis results. This article presents those used results to analyse and evaluete the Physics 12 essay exam, ensure scientific and objective in the direction of assessing high school student’s ability