The study examined the relationship between the parental involvement and student achievement and how parent involvement in terms of encouragement, modeling, reinforcement and instruction influences student achievement in Diliman Preparatory School SY 2021-2022. The data were gathered utilizing a the adapted and modified questionnaire and administered to 128 parents of the students enrolled in the intermediate grade level of Diliman Preparatory School. Results showed that parents are strongly agree that they encourage their children to believe that they are capable of learning new things, that they can succeed in school. In terms of modeling, the parents show to their child that they must not give up when things get tough in school and they show that they gain as much knowledge as possible, and they can learn new things. In terms of reinforcement, parents are strongly agree that they show their child that they like it when their child is eager to learn new things and skills to develop and maintain their child?s attributes which can result with positive learning outcomes. In terms of Instruction, they teach their child to ask questions when they are unsure about something. and adhere to the teacher's instructions. Finally, the relationship between parental involvement and child?s performance was found to be negative. However, the strength of that relationship varied based on the type of assessment used to measure student achievement. The current study found that majority of parents are involved in their children?s education, however, more awareness of the parental involvement is needed and more strategies on parental involvement needs to be employed for the success of the new curriculum.