Answer:
hide me from your parents if you have done bad academically this year.
I'm sometimes white but most often I'm black. I take you there but never bring you back.
I can never be stolen from you. I am owned by everyone. Some have more some have less.
At night I come without being fetched, and by day I am lost without being stolen. What am I?
I am a place where time is told. I am not bought and I am not sold. What am I?
Give it food and it will live, give it water and it will die.