The Impact of English Language Proficiency on Academic Performance among Senior Secondary Students in English-Medium Instruction International Schools: A Critical Literature Review
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The Impact of English Language Proficiency on Academic Performance among Senior Secondary Students in English-Medium Instruction International Schools: A Critical Literature Review
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Critical Review of English Language Proficiency and Academic Achievement in EMI International Schools
Contextual Foundations of English Language Proficiency in English-Medium Instruction
The proficiency in the English language is becoming a central determinant of academic outcomes, especially in English-medium instruction (EMI) international schools where instruction is delivered in English and students are expected to study content subjects through the English language (Lehman, 2023; Silver, 2024). Among senior secondary learners, mastery of English extends beyond everyday communication and directly influences the ability to understand complex academic concepts, express knowledge effectively, and engage successfully with curriculum materials. Students possessing higher levels of English proficiency consistently demonstrate stronger academic performance across multiple subject areas, whereas limited language proficiency often restricts comprehension and overall academic success (Martirosyan et al., 2015; Mihret & Bewuket, 2018). Additionally, psychological and instructional factors, including self-efficacy, learning strategies, and pedagogical approaches, significantly influence both language acquisition and academic achievement (Cui & Gardiner, 2024; Guo & Tang, 2025).
This literature review critically evaluates empirical and theoretical studies examining the relationship between English language proficiency and academic performance, identifies key mediating variables, and highlights existing research gaps that justify the present study.
Empirical Relationship Between English Language Proficiency and Academic Performance
Numerous empirical investigations consistently report a positive relationship between English language proficiency and academic achievement among secondary school and international students. Martirosyan et al. (2015) demonstrated that international students with stronger English proficiency consistently achieved higher performance across content-based subjects, illustrating the importance of language competence for successful curriculum engagement. Similarly, Mihret and Bewuket (2018) found that proficiency in reading, writing, and comprehension strongly predicted overall academic performance, emphasizing that English mastery serves as a prerequisite for educational success within EMI environments.
The challenge becomes even more pronounced within EMI international schools, where students simultaneously acquire language proficiency while mastering subject-specific knowledge. Strand and Hessel (2018) reported that relatively minor deficiencies in English proficiency may significantly hinder comprehension of academic materials, resulting in poorer examination performance. Likewise, Aizawa et al. (2020) observed that students performing below established language proficiency thresholds encountered considerable difficulty interpreting complex academic texts, negatively affecting overall academic achievement.
Research conducted throughout Asia further supports these findings. Tai and Zhao (2022) concluded that secondary school students possessing stronger English language proficiency demonstrated superior performance in university-level academic English, suggesting that language competence produces long-term educational benefits. Perry and Vlachopoulos (2023) similarly reported that students with lower English proficiency required extensive instructional scaffolding before achieving academic outcomes comparable to native English speakers.
Although strong evidence supports a positive association between English proficiency and academic performance, scholars acknowledge that additional variables—including socioeconomic background, previous English exposure, and learning motivation—contribute to differences in educational outcomes. Silver (2024) therefore argues that language proficiency alone cannot fully explain academic success and recommends greater attention to cognitive and motivational mediating variables.
Influence of Self-Efficacy and Learning Strategies on Language and Academic Achievement
Self-efficacy, defined as students' confidence in their ability to complete learning tasks successfully, represents an important predictor of both language acquisition and academic achievement. Wang and Sun (2020) demonstrated through meta-analysis that students with stronger self-efficacy consistently employ more effective language learning strategies, resulting in improved English proficiency and superior academic performance. Likewise, Guo and Tang (2025) established a direct relationship between self-efficacy and English academic achievement among high school students, suggesting that confidence enhances persistence, engagement, and resilience within EMI environments.
Cognitive and metacognitive learning strategies also contribute significantly to academic success. Saks and Leijen (2018) found that students who actively planned, monitored, and evaluated their learning achieved greater improvements in both English proficiency and overall academic performance. Similarly, Tai and Zhao (2024) emphasized that strategic learning behaviors—including vocabulary development, note-taking, summarization, and self-monitoring—produce measurable improvements in language acquisition and educational outcomes.
Cui and Gardiner (2024) further argued that self-efficacy influences students' willingness to adopt effective learning strategies and persist despite academic challenges. Within EMI international schools, where students encounter simultaneous linguistic and academic demands, confidence and strategic learning become particularly important. Soland and Sandilos (2020) additionally reported that students possessing lower self-efficacy frequently experience greater language anxiety and weaker academic performance, reinforcing the mediating influence of psychological factors.
Pedagogical Approaches Supporting English Language Development and Academic Success
Instructional practices substantially influence both English language acquisition and academic achievement. Lehman (2023) argues that transparent institutional language policies within EMI schools improve students' access to curriculum content by establishing clear expectations and consistent language support. Perry and Vlachopoulos (2023) likewise found that differentiated instruction tailored to students' English proficiency levels significantly increased classroom participation and academic success.
International curricula, including the Cambridge Curriculum, increasingly integrate language development into subject instruction. Mailatun Nazizah et al. (2024) demonstrated that students receiving embedded language support within content courses consistently achieved stronger academic outcomes than those experiencing separate language instruction. Hakuta et al. (2000) similarly concluded that structured immersion, guided practice, and continuous formative feedback accelerate students' development of academic English proficiency.
Scarcella (2003) further emphasized that academic English proficiency requires mastery of discipline-specific vocabulary, critical reading, academic writing, and argumentation skills. Instruction explicitly targeting these competencies enables students to bridge the gap between language development and subject mastery. Racca and Lasaten (2016) similarly concluded that the effectiveness of language instruction largely depends upon the pedagogical approaches adopted by educational institutions.
Critical Evaluation of Existing Research and Identification of Knowledge Gaps
Current literature consistently supports a positive relationship between English language proficiency and academic performance while highlighting the mediating influence of self-efficacy, learning strategies, and pedagogical practices. Nevertheless, several important research gaps remain.
- Most existing studies focus primarily on university or tertiary students rather than senior secondary students enrolled in EMI international schools.
- Limited research simultaneously examines the interaction between English language proficiency, self-efficacy, learning strategies, and pedagogical approaches within EMI secondary education.
- Longitudinal investigations examining the development of language proficiency and its cumulative influence on academic achievement remain relatively scarce.
These limitations demonstrate the need for further investigation focusing specifically on senior secondary learners studying within English-medium international school environments.
Theoretical Foundations Informing the Study
The present study is grounded in Bandura's Social Cognitive Theory, which proposes that learning results from reciprocal interaction among personal, behavioral, and environmental factors. Within EMI schools, students' English language proficiency represents the behavioral component, self-efficacy reflects the personal component, and pedagogical approaches constitute the environmental influence (Wang & Sun, 2020). Students possessing greater self-efficacy are more likely to adopt effective learning strategies, persist through academic challenges, and ultimately achieve stronger educational outcomes (Guo & Tang, 2025).
The Threshold Hypothesis proposed by Cummins further explains that students must attain a minimum level of language proficiency before successfully engaging in cognitively demanding academic tasks. Below this threshold, inadequate language proficiency significantly restricts comprehension and academic achievement (Tai & Zhao, 2022). Collectively, these theoretical perspectives provide a comprehensive explanation for the interaction among language proficiency, psychological factors, instructional practices, and academic performance.
Conceptual Relationship Among the Study Variables
The conceptual framework positions English language proficiency as the principal independent variable influencing students' academic performance. Self-efficacy and learning strategies function as mediating variables that strengthen or weaken this relationship, while pedagogical approaches provide the environmental context within which language learning occurs (Lehman, 2023; Perry & Vlachopoulos, 2023).
Students demonstrating stronger self-efficacy are more likely to employ effective metacognitive strategies, including planning, monitoring, and evaluating their learning. Likewise, instructional practices such as differentiated instruction, scaffolding, and curriculum-integrated language support create learning environments that facilitate both language acquisition and academic achievement. Academic performance, measured through examination results and subject achievement, therefore reflects the combined influence of language proficiency, psychological readiness, learning behaviors, and instructional quality.
Integrated Synthesis of Literature
The reviewed literature consistently demonstrates that English language proficiency represents a significant predictor of academic performance within English-medium instruction environments. Students possessing stronger English proficiency generally achieve superior academic outcomes, while self-efficacy, effective learning strategies, and supportive pedagogical approaches substantially strengthen this relationship. Despite considerable empirical evidence, important research gaps remain regarding senior secondary students enrolled in EMI international schools, particularly concerning the interaction among language proficiency, self-efficacy, learning strategies, and instructional practices. Addressing these gaps will contribute to a more comprehensive understanding of language learning and academic achievement within contemporary international education.
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