Description This workbook is published in accordance with the 2022 revised curriculum applied to 3rd-4th grade elementary students starting in 2025. It is essential reading for students aiming to become truly top-tier learners. Rather than focusing solely on textbook-level concepts, it incorporates practical application concepts, critical thinking concepts, and concepts that connect to future learning, helping children understand the subject matter from a mathematical perspective. Additionally, reflecting the new curriculum, the book strengthens subject competencies and strategically arranges problems by difficulty level to help every student challenge themselves toward the top tier. The solutions have also been improved with the detailed, differentiated explanations unique to Choisangwi, making it easier for parents to guide their children. With unit-based competition-level problem sets and assessment sheets designed to build CSAT-style critical thinking skills, this workbook will help students develop top-tier mathematical thinking abilities from an early grade level. Table of Contents 1. Multiplication 2. Division 3. Circles 4. Fractions 5. Capacity and Weight 6. Organizing Data