The used instruments are valid to assess students’ grammatical knowledge, LOTS and HOTS
The instrument employed to assess grammatical knowledge, LOTS, and HOTS was both reliable and valid. Beyond reliability, the validation of the instrument through confirmatory analysis further strengthens the study. The results indicated that the proposed three-factor structure, grammar, LOTS, and HOTS, was an appropriate representation of the data. This alignment demonstrates that the test items meaningfully differentiated between basic language knowledge and the more complex cognitive knowledge.
The validation of the test is particularly important in contexts such as higher vocational education, where students are required to bridge foundational grammatical knowledge with increasingly complex reasoning tasks. By establishing the reliability and validity of the instrument, this study not only supports the interpretation of the present results but also contributes a tool that may be adapted for future research on language learning and cognitive skill development.
Learners’ performance on grammar-focused items is not directly related to their performance on both lower-order and higher-order cognitive tasks
The findings indicated that there was no significant correlation between learners’ grammar knowledge and their performance on LOTS or HOTS. This suggests that grammatical knowledge does not directly determine learners’ outcomes in cognitive tasks. These results differ from earlier studies, such as those by Muter et al. (2004) and literature reviews analysed by Hjetland et al. (2020) and Jago et al. (2025), which highlighted positive associations between grammar and cognitive performance.
Although learners with stronger grammar knowledge can provide a foundational support for basic language-related cognitive tasks (Aro, 2009), the present findings highlight that grammar may function indirectly. Instead of exerting a direct effect on LOTS or HOTS, grammar might facilitate cognitive engagement through other skills, such as vocabulary or comprehension (Ünaldı & Yüce, 2021). In addition, higher-order tasks such as analysis, evaluation, and critical thinking rely less on grammatical knowledge and more on reasoning (Paulsen & Kolstø, 2022), inference (Acierno et al., 2025), and problem-solving abilities (Koçoğlu & Kanadlı, 2025; Wang et al., 2024).
Regarding the correlation between LOTS and HOTS, on the other hand, the current research found a correlation between the two types of comprehension. This is consistent with previous findings by Jansen & Möller (2022), who studied 36 pre-service teachers. The study found a correlation between the quality of LOTS and HOTS. This strong positive correlation between lower-order and higher-order thinking skills suggests that learners who perform well in basic cognitive tasks may also excel in more advanced thinking skills (Zohar & Dori, 2003).
Achievement in grammar knowledge predicts learners’ lower-order, and higher-order cognitive skills and the potential of LOTS as a mediator
Grammatical knowledge predicts lower- and higher-order thinking performance. Grammatical competence provides the necessary foundational syntactic (Gan, 2024) and structural awareness for tasks (Deng et al., 2022) such as identifying information (Zhang & Tong, 2025), recognising patterns, and applying straightforward rules (Jiang & Su, 2025). These skills facilitate engagement with lower-order tasks, including remembering, understanding and applying knowledge.
With regard to the higher-order thinking tasks, grammar instruction can also encourage critical thinking (Van Rijt & Coppen, 2021). These include metacognition, contextual interpretation, and abstract reasoning (Liu et al., 2024). Background knowledge, motivation, problem-solving strategies and general intelligence play a more substantial role in shaping learners’ skills to perform well in advanced, cognitively demanding contexts (Li et al., 2023). These findings have important implications for language education and assessment. It is therefore suggested that grammatical instruction be integrated within richer contextually embedded tasks that require analysis and evaluation.
The indirect pathway from grammar to HOTS via LOTS was therefore substantial (see Fig. 3). This finding enriches the understanding of how grammatical competence interacts with cognitive skill development. Although grammar knowledge is not directly predictive of HOTS, it plays a foundational role in scaffolding cognitive processes that later facilitate higher-order reasoning. In other words, LOTS may operate as the “bridge” that channels grammatical knowledge into more complex domains of analysis, evaluation, and synthesis. A pattern resonates with Bloom’s hierarchical view of cognitive skills, where mastery of basic forms of knowledge is a prerequisite for higher levels of critical engagement. This mediation pathway provides an important theoretical and pedagogical implication. From a pedagogical perspective, the findings suggest that instructional approaches emphasising grammar as a tool for enhancing LOTS may indirectly strengthen students’ HOTS. From a research perspective, the result points to the value of integrating mediation models in studies that examine the cognitive role of linguistic knowledge.
Limitation
One limitation of this study is the characteristics of the sample. As the participants were drawn from a single group of vocational higher education students, the findings may not be generalisable to broader populations. Learners in other educational contexts, such as academic universities, secondary schools, or adult language learning programmes, may exhibit different patterns of relationships between grammatical knowledge and cognitive performance.
A further limitation lies in the measurement of constructs. Grammar knowledge and cognitive skills were assessed using multiple-choice tests. While this is practical for large-scale testing, it may not capture the full complexity of learners’ language proficiency or cognitive skills.
Finally, the study did not incorporate longitudinal or intervention-based designs, which would allow for stronger claims to be made about developmental trajectories or instructional effects. A cross-sectional dataset only provides a snapshot of learners’ abilities, making it difficult to determine how grammar knowledge supports the progression from lower-order to higher-order thinking skills over time. Future research could employ experimental or longitudinal methodologies to explore how targeted grammar instruction might enhance not only immediate test performance but also broader cognitive and academic outcomes.