Class 6 horses are Shin-horse/Un-winning horse races that have no rating.
Therefore, horses that are promoted to the 5th grade must compete in a handicap race according to the rating, so a rating must be given. 경마 Horses that have won the 6th class race are automatically promoted to 5th class, and horses that have won 2nd place 2 times, or 2nd place 1 time 3rd place 2 times or 3rd place 3 times can be promoted to 5th class.

At the end of the 5th grade, the initial rating given at the end of the grade is 27~32 (the same rating is given regardless of age and gender). The second or third place can be given a lower rating than the basic rating.Horses that are upgraded to grade 5 are given the same rating regardless of age and gender, and the weight reduction for low-age horses and mares is applied. Adjusted by KG loss.

Weight loss for low age horses and mares is commonly applied to grades 1-5 races.
First rating for mixed grade 4 foreign horses

The first rating given for grade 4 foreign horses is 42 points and the same rating is given regardless of age or gender.
For foreign horses, the same rating is given regardless of age and gender, and the weight reduction for low-age horses and mares is applied by period.