Reading Comprehension is the ability to define word by word and create a profound idea from the talks were given or read. It plays a significant role in the total functioning of a community. It is also one of the pillars of reading. This paper aims to assess the Reading Comprehension level of the Senior High School in their Core Science Subjects and determine different factors that affect one's reading comprehension skills. A descriptive survey attempts to establish the range and distribution of some social characteristics, such as education or training, occupation, and location, and to discover how these characteristics may be related to certain behavior patterns or attitudes. The instruments used to assess Reading Comprehension has three difficulty level; Upper beginner-level story, Intermediate-level story, and Upper Intermediate level story. Students with a 75% and above correct answer are categorized as "mastery level." Students with 50%-74% correct answers are categorized under "near mastery level." While the category "low mastery level" is for students with a score of 49% and below. The students were categorized based on the reader category of Imam (2014). In terms of reading comprehension skill result, it shows that only 7% of the total respondents are classified as Mastery Level readers. The result is trifling compared to the 49% near mastery level and 44% poor mastery level.