The effectiveness of teaching practice is closely related to the teachers' proficiency on the contents of the subject taught. For Jawi subject, the contents refer to the teachers' proficiency on the Complete Jawi Spelling System (CJSS). The teachers' proficiency of CJSS will highly affect the students' proficiency in Jawi reading and writing and their knowledge in Islamic Studies subject indirectly. However, the study found that the students' proficiency in Jawi is still low and moderate. The

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... ortcomings were found to be stemmed from poor proficiency in the contents of CJSS among Islamic Studies teachers. Thus, this study aims to examine the level of knowledge and skill acquisition of CJSS of Islamic Studies teachers in Malacca. This quantitative research used descriptive statistics, which were percentage and mean value to report the finding. The questionnaire used a five-point Likert scale conducted on 217 respondents. The results showed that the proficiency level of CJSS of Islamic Studies teachers was high (mean = 4.074, sd = 0.350). In general, it can be concluded that the Islamic Studies teachers in Malacca have mastered the contents of Jawi lessons, which was CJSS.