Assuming your still a minor and cannot leave home yet, take the assignment. Your mom will be off your case and you'll have some peace for a while. Public speaking is always a benificial skill to have. Learn what your religion is all about and what doctrin they teach so you can plant questions/seeds of doubt in the rest of your family. Just being rebelious with no excuse just causes more trouble for you.
Of course this advice will be thought to be straight from Satan himself by any loyal JW. You do have a right to question anything in life and I hope you have a good one.
HCM