8 students scored 100, so net score = 8*100 = 800
5 students received 60, so net score = 5*60 = 300
Remaining number of student s = 25-5-8 = 12 students
Let the score of each of these students be x, so the net score = 12*x = 12x
So total score = 800 + 300 + 12 x
Average score = (800+300+12x)/25
Average score = 83
Therefore, we equate both the average scores
(800+300+12x)/25 = 83
1100 +12x = 25*83 = 2,075
12x = 2,075-1,100
12x = 975
x = 81.25
Average score of the remaining students = 81.25