The researcher determined eleven grade 3 learners belonged to the struggling level where they got low scores in pre-test of the Functional Literacy Assessment Tool (FLAT) in the first quarter of SY 2022–2023. Nevertheless, with the commitment and dedication of the researcher as a teacher, the researcher decided to develop reading material that suited the learners. Moreover, it aimed to develop a contextualized skill book in English to improve the reading level of grade 3 learners. Accordingly, the study focused on improving the reading level and effectiveness of the contextualized skill book used. Furthermore, learners' reading levels improved after the intervention's implementation. In addition, pre-test and post-test results showed a significant difference, which implies that the intervention is effective. Particularly, as perceived by the learners, the contextualized skill book improved their reading abilities and academic performance in other subjects, consequently their love for reading developed. Finally, the contextualized skill book used showed effectiveness among the respondents, as well as appropriate for struggling learners. Similarly, the skill book was extremely recommended for use by other educators in the improvement of the reading level of their learners. Therefore, the researcher recommended that other researchers develop a contextualized skill book used as an intervention for struggling readers because it proved effective in improving the reading level of learners.