THERE IS A SCHOOL SHOOTER THE TEACHER BUT RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

One tills the mind and the other minds the till. Did you answer this riddle correctly?
YES  NO  

To become a first aid kit Did you answer this riddle correctly?
YES  NO  

The ruler! Did you answer this riddle correctly?
YES  NO  

It always went back four seconds! Did you answer this riddle correctly?
YES  NO  

Hiss-tory! Did you answer this riddle correctly?
YES  NO  

Neither, you should use a pen! Did you answer this riddle correctly?
YES  NO  

Because it already had a million degrees! Did you answer this riddle correctly?
YES  NO  

Because he only had one pupil! Did you answer this riddle correctly?
YES  NO  

The library! Did you answer this riddle correctly?
YES  NO  

I wouldn't fit through the door. Did you answer this riddle correctly?
YES  NO  

The student is double counting a lot of the days. A lot of the time spent sleeping, eating, and relaxing occurs during weekends and the summer. Weekends also occur during the summer, so all of these hours are getting counted several times.

And, school is not an all day affair. So the 4 days actually represents more days of school. If school is 6 hours per day, those four days represents 16 days of school. Did you answer this riddle correctly?
YES  NO  

A blood test. Did you answer this riddle correctly?
YES  NO  

They both test the pupils. Did you answer this riddle correctly?
YES  NO  

They are bells Did you answer this riddle correctly?
YES  NO  

Getting lost Did you answer this riddle correctly?
YES  NO