The present study was undertaken to study the impact of parental involvement on academic achievement of secondary school students at Deomali Block in Tirap District of Arunachal Pradesh. The study adopts a descriptive research design with mixed method of data collection. The population of the study were the parents, guardians, teachers and the students studying in grades VI - X of secondary schools affiliated to CBSE under Deomali Education Block with a sample size of five hundred and seventy six (N=576) through random sampling were included. The purpose of the study was to analyse the relationship of academic achievement with parental involvement. A self-developed questionnaire on parental involvement for teachers, parents and students was used for data collection along with school academic records for the academic session 2023-2024 has been taken as scores and record. The present study found that there is a significant gender differences between the academic achievement levels of low and high levels of parental involvement showing a significant difference between the academic achievement of boys and girls. The present study reveals that the parental involvement plays an important role in academic achievement of students. Therefore, school authority should conduct awareness programme and workshops centered on child caring for parents. However, a parent-teacher association will also make an effective initiative to solve the ignorant parents in child’s academic activity.