Next grade math will be easy!
A mathematical principle reinforcement application book that clearly identifies common mistakes.

EBS Elementary School Nuclear Power!

To increase learning efficiency and to focus on weak areas, it is divided into two areas: numbers and operations and shapes and measurements.
Depending on the level of difficulty and importance, the easy parts are studied simply, and the difficult parts are studied thoroughly in 'reinforcement units'.
“EBS Elementary Mathematical Power” and Manja allow for self-directed learning from basic to advanced levels through various types of problems!

EBS Elementary Site (primary.ebs.co.kr) provides free lectures and a numerical ability diagnostic assessment for this textbook.