The purpose of this study was to determine the extent to which the pre-test and post-test carried out by teachers in grade IV mathematics subjects in the success of learning evaluation in a COVID-19 pandemic situation like this. This research uses descriptive quantitative research methods with qualitative research type case studies and research subjects 2 fourth grade elementary school teachers at SDN Bojong 04 Tangerang City. The research instruments used were observation, interviews, documentation and field notes. The data analysis technique was carried out in accordance with the scientific procedure of case study qualitative research. Teachers do pre-test and post-test using existing technology as a tool. The results obtained in this study are that not all pre-test and post-test techniques carried out by grade IV teachers showed success in increasing student understanding because they were caused by several factors, both internal and external. However, the teacher tries as much as possible to find ways to overcome these obstacles so that all students can feel the learning activities. Then, the pre-test and post-test techniques carried out by the fourth grade teacher are said to be successful if the students who have understood the material are more than 70%.