how to see my son

MY SELF AND MY WIFE ARE SEPARATELY LIVING SINCE LAST 3 MONTHS, NOR WE R TALKING. OR SEEING, BUT SON GOES TO PRE SCHOOL WHERE I HAVE ADMITED HIM. BUT I AM PAYING SCHOOL FEES REGULARLY, I WOULD LIKE TO SEE MY SON .TALK TO HIM DURING SCHOOL HOURS, BUT MY WIFE HAD CONTACTED THE SCHOOL AUTHORITES AND TOO TOOK PERMISSION FROM THEM NOT SEE MY SON, IN THIS CASE WHAT IS THE PROCEDURE TO SEE MY SON OR TALK TO HIM, CAN I FILE A CASE THROUGH COURT, IF IT IS SO, WHAT KIND OF CASE CAN I PUT,

 PLZ ADVISE