Test item is one of the evaluation tools that provide information for teachers regarding the level of students’ understanding. One of the activities to improve the quality of test items is by teachers’ collaboration. Teachers’ collaboration in developing test items is the process by which a number of teachers work together to develop a set of items that are relevant, meaningful, and aligned with learning objectives. The purpose of this research is to find out the teachers’ collaboration activities in developing test items, teachers’ awareness in constructing summative test, and challenges while collaborating to develop test items. Data were obtained from 3 English teachers in MAN Model Banda Aceh through semi-structured interview. The research design of this study was qualitative research. The result of this study showed some stages of teachers’ collaboration in developing test items; these stages were conducting monthly MGMP meeting, conducting a deeper discussion with the same grade teacher, rechecking the test items and pretesting the students. Then, the result also showed teachers’ awareness of constructing English summative test which included determining type of test, utilizing the sources, dividing the number of questions, selecting indicators, and choosing distractors. However, the teachers faced some challenges in developing test items collaboratively, they were differences in teaching approaches, challenge in time coordination, challenge in established curriculum cohesivity and difference in understanding the difficulty level of the test items.