This research aimed to explore using PQ4R strategy on developing critical reading skills and motivation for learning English for preparatory school underachieving pupils. The essential critical reading skills for 1st year prep school pupils were determined through using a checklist approved by a panel of jury specialized in teaching EFL and special needs. The researchers prepared and employed a critical reading skills' test and a motivation scale for learning English. The psychometric properties of them were verified. The research participants were selected and divided into an experimental group and a control group. Each group consists of (20) pupils. The experiment lasted for six weeks and the quasi-experimental design was followed. Data analysis confirmed that using PQ4R strategy has a great effect on developing critical reading skills and motivation for learning English for 1st year prep school underachieving pupils. So, the aim of the research was attained as using PQ4R strategy revealed a great effect size on developing the critical reading skills and motivation for learning English for 1st year prep school underachieving pupils of the experimental group. Based on the findings, it was suggested that instructors should give more attention to critical reading skills in English for preparatory stage through using PQ4R strategy. Also, using PQ4R strategy in developing other language skills for preparatory stage underachieving pupils was suggested