<![CDATA[This study aims to examine whether the use of the QuizWhizzer application affects students' achievement in grammar and how significant the effect is. This study was conducted at SMA Negeri 1 Panyabungan Selatan using a quantitative method with an experimental design. Two classes were involved as samples: class X-1 consisting of 20 students as the experimental group taught using QuizWhizzer, and class X-2 consisting of 19 students as the control group taught using worksheets. Data were collected through tests, and then analyzed by applying normality tests, homogeneity tests, and independent sample t-tests. The results showed that students in the experimental class showed a significant improvement in their grammar achievement compared to those in the control class, who only showed slight progress. The t-test analysis revealed that t-count (2.639) was higher than t-table (2.026) and the significance value was 0.012 < 0.05. This indicates that QuizWhizzer has a significant positive effect on the grammar achievement of tenth-grade students of SMA Negeri 1 Panyabungan Selatan.]]>
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