Why Students Fails in Exams?

 Because.... 8 hrs of sleep evry day = 122 Days 

 365-122=243.

 Summer holidays = 61 Days 

243-61=182.

 Sundays in a year = 52 Days

 182-52=130.

 Festival Holidays = 40 Days 

130-40=90. 

3 hrs of daily playing = 46 Days

 90-46=44.

 Winter holidays = 15 Days

 44-15=29.

 [greee]1 hr of chatting per day=  15 Days

 29-15=14.

 Sickness Days = 10 Days

 14-10=4.

 Film time in a year = 3 Days

 4-3=1. Remaining 1 day is their B'Day..