In this paper, we evaluate the efficacy of liberal arts English courses using the TOEIC® Writing Tests IP. The paper analyzes the outcomes of the TOEIC® Writing Test IP in 2022, contrasting these with the data from 2018 and 2019. The results in 2022, while having average scores close to those of 2019, exhibited less variability, indicating that instruction adapted necessary to a post-pandemic world has been achieved. This study is important in evaluating the current status and future challenges of writing instruction within these courses. The study lends support to the notion that proficiency tests can be valuable tools in liberal arts English courses, facilitating objective assessment and strategic enhancements in instructional methodologies, and thereby maintaining or enhancing students’ English proficiency. For example, in our situation, our analysis has led us to consider the needs of students with the highest levels of English, and whether there may be better ways of organizing courses to help such students improve their writing proficiency.