Metacognitive reading strategies play an essential role in improving reading comprehension. This study explores the effects of English metacognitive reading strategies and reading comprehension in Kuwaiti primary school students as foreign language learners; this experimental study tries to find a relationship between students' metacognitive strategies, metacognitive strategies, and students' reading performance. Participants were fifth grade EFL students in Kuwait primary education government public schools. The students' reading comprehension was evaluated. Comprehension tracking strategies were measured using Metacognitive strategies (K-W-L Plus). While the experimental groups (B) received instructions according to (K-W-L Plus) techniques, the control (A) group was trained with the traditional teaching approach based on the Kuwait national curriculum school textbooks. A questionnaire investigating the use of English and perceived English proficiency was also conducted. The results revealed that Perceived proficiency in English was not determined by the early or late pre-school age of second language acquisition. Also, bilingual students with perceived proficiency in English had better meta-cognitive reading skills than low perceived proficiency in English. Comprehension monitoring and (K-W-L) strategy was adequate and the most important predictor of reading comprehension among all students in the research sample.