So the sixth grade received 560/5*2=224 copies.
The remaining books are ***336.
The rest will be lent to the May 4th grade according to the score of 2: 1.
Then the fifth grade was assigned to 224 books and the fourth grade was assigned to 1 12 books.
So the fourth grade was assigned to 1 12 books, the fifth grade was assigned to 224 books, and the sixth grade has been receiving 224 books.