Flipped class refers to an approach that in reverse from traditional teaching method. This study aims to explore teachers’ perspective on the implementation of the flipped classroom model, identify challenges that are perceived by teachers and find out how they assess student achievement in teaching English grammar to senior high school students. Through a qualitative approach, semi-structured interviews were conducted with three English courses teachers at SMKN 1 Al-Mubarkeya Ingin Jaya who have been using and teaching the students through flipped learning strategies. The results found that teachers used trigger question, pre-test and post-test as the tools of assessment and also include used both of formative and summative assessments. The results reveal that flipped learning was hold significant potential for enhancing English grammar for students. However, challenges such as lack of enthusiasm from students, lack of facilities, teacher have to master the use of technology has been highlighted to support the study. Overall, the study concludes that flipped learning has a good impact compare to traditional learning.