KATHMANDU, JUNE 19 A total of 64.13 percent of students have been graded in the Class 12 examination results published today by the National Examination Board. According to the Board, 69.75 percent of students under the regular category and 42.38 percent under the partial category have been graded. A total of 418,179 students appeared in the examination this year, including 332,241 under the regular category and 85,929 under the partial category. Out of them, 268,190 students have received grades in all subjects. This includes 231,770 students from the regular category and 36,420 from the partial category.