Oregon's Statewide Assessment System Test Prep: 4th Grade Math Practice Workbook and Full-length Online Assessments: OSAS Study Guide

Want to boost your child’s Grade 4 math skills and Oregon OSAS readiness?Lumos’ Oregon OSAS blended program (Workbook + Online Access) helps your child improve scores by 10% or more* in the 2025-26 OSAS assessment through realistic test simulations, targeted skills practice, and AI-powered intervention.This blended program includes:Practice questions in the book covering 30+ Grade 4 math skillsAn efficient auto-grading feature provides quick, accurate online results along with detailed explanations2 full-length online practice tests that simulate Oregon’s OSASPersonalized online study plan for targeted practiceAI Tutor for clear step-by-step explanations, hints, and instant feedbackOnline program access codeTrusted by over 1.6 Million students and 200,000 teachers.Reduce your child's OSAS test anxiety using Lumos' Smart Test Prep MethodologyLumos’ Smart Test Prep Methodology blends realistic Oregon test simulations, personalized guidance, and targeted practice to help students get ready for the state test.Students begin with a simulated OSAS test, follow an AI-personalized study plan, practice essential skills, and repeat the cycle—steadily building the skills and confidence they need for the Spring OSAS.Why is Lumos' OSAS Practice Workbook the Smart Choice for 2025–26?Realistic Practice Tests: Two full-length tests that simulate OSAS format, question types, rigor, standards, and pacingPersonalized Study Plan: Online Diagnostic Tests generate a personalized study plan for targeted skills practice using the workbookLumos AI Tutor: A built-in, on-demand AI coach that delivers real-time assistance just like a personal tutorOnline Program Access: Features guided practice questions, solved examples, a performance insights dashboard, videos, mind maps, flashcubes, and other engaging test prep resourcesWhy Parents Trust Lumos tedBook for Oregon OSAS Success?Lumos has a history of delivering measurable results. Its realistic test preparation builds confidence, and the performance reports offer clear insights into strengths and areas for improvement. With Lumos tedBook, families feel assured that their child is fully prepared to succeed on the Oregon state assessment.“This book is awesome—I’ve bought it two years in a row. We used it to study for the OSAS Math in 3rd grade and the OSAS Math in 4th grade, and my child aced both tests with a score of 4. The online resources that come with the book are amazing. Kids can practice online tests and individual lessons as many times as they want.” — JesseniaHow Do Teachers Use Lumos tedBook in Their Classroom?Teachers use Lumos tedBook to deliver personalized, standards-aligned practice that reinforces classroom learning. In addition to giving students the opportunity to experience a realistic OSAS simulation, Lumos Teacher Accounts provide access to insightful reports and guided classroom instructions to bridge learning gaps, track progress, and build student confidence for the OSAS assessment. It’s ideal for classroom reinforcement, tutoring, or homeschooling.“Amazing resource for practicing 4th-grade math state benchmark test! The data collection and analysis tools are exactly what I need to measure growth and predict pass/fail outcomes for upcoming benchmarks.” — Ashia SmithPrepare with confidence—order now and get ready for OSAS success!Also available for Grade 4 ELA OSAS Practice.*10%+ improvement in state assessment scores is based on students who used the program consistently for about 45 minutes per week. Individual results may vary based on usage and completion of practice tests and the study plan. Read more