This study aims to determine the validity of learning tools with peer tutoring models in improving student learning outcomes and Self Efficacy on Newton's Law material. The development model used is the ASSURE model, but only to stage 5 (Requires Learner Participation). Test the product in step 5 using Tessmer. The validation data subjects were 3 expert validators, while the practical data subjects were 2 partner teachers, and the effectiveness data subjects were grade VIII students of SMPN 10 Banjarbaru. The type of data collected is validity data. Validity data collection techniques are carried out through the validation of learning tools developed using the validation sheet instrument. Data analysis was performed using descriptive techniques. The results showed that, the developed learning tool has a very valid category. This result is supported by the opinions of 3 students in individual trial activities (one to one). Based on the results of development and research shows that the learning tools developed are valid, practical and effective.