The next time your teacher asks you why you didn’t study, tell him / her:-

“A year has 365 days.  

After taking away 52 weekends; 1 day of rest and I have to do household chores on the other day, that’s 104 days.  Now there are only 261 days left.  
I need 8 hours of sleep, and in a year that adds up to 122 days so now I’m left with 141 days. 
We need exercise to stay healthy, so that’s 1 hour a day, and suddenly 15 days are gone, which leaves me with 126 days. 
I need to eat, and I spend about 2 hours a day eating, that uses up 30 days, and so I’m left with 96 days.  
Communication is important, so say I spend 1 hour a day speaking to friends and family, that takes away 15 days more, which leaves me with  81 days.
Exams and tests take up at least 35 days, so then I’m only left with 46 days.
Taking off approximately 40 days for holidays, I am only left with 6 days. 
I will probably be ill for a minimum of 3 days, and that leaves 3 days in the year to study! 
Even if I only go out for 2 days.  I’m left with 1 day! But that 1 day is my birthday!