Abstract: This study analyzes the errors committed in Calculus and determines appropriate strategies to remediate them. The question that this paper explores is the students Mathematical Proficiency in Basic Calculus. How are students described in terms of strategic competence, conceptual understanding, and procedural fluency? What are the errors committed by the students? Which among the errors are most prevalent? What teaching strategies can be incorporated to remediate the identified errors? In order to explore these questions, this paper uses the collection of scripts (examination) that was administered to Senior High School Students. In order to answer the question, expert respondents give scores and identified the errors committed.