This study explores the impact of spiral teaching on students' performance on Quadratics at O-level. Eight boys from Grade 11 participated in the action research study, in which a mixed method was used. Data were collected using questionnaires, worksheet and interviews. Analysis revealed that spiral teaching has positive impact on students in terms of mathematical fluency, content retention and mastery of concepts in quadratics. Most of the students agreed that spiral teaching helped to improve their understanding of the topic. However, a major challenge is the subsequent reduction in instructional time when reviewing of previous lessons.