This study aims to assess the effectiveness of using Quizizz in improving students' vocabulary acquisition. Various studies have shown that this interactive platform can significantly improve students' vocabulary. In this study, the average pre-test score of students was recorded at 30.71, while after using Quizizz, the score increased to 68.06, which shows the effectiveness of this platform. In addition, another study showed a 24.34% increase in vocabulary acquisition, with a significant difference between pre-test and post-test scores. Repeated use of Quizizz was also demonstrated to progressively improve students' scores, as seen in a classroom action study, with a score increase from 55.31 in the pre-test to 91.87 in the second cycle post-test. In addition to vocabulary acquisition, Quizizz also managed to increase students' enthusiasm and engagement in the learning process, which positively impacted their learning experience. This study also shows that collaborative activities combined with Quizizz can further strengthen vocabulary acquisition. Overall, using Quizizz proved effective in improving vocabulary acquisition, strengthening learning motivation, and creating a fun learning atmosphere. The platform also allows lecturers to provide quick assessment and feedback and monitor student progress through its analytics feature. Therefore, quizzes are an effective tool for supporting vocabulary learning at the university level.
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