I am an 8 letter word, kept secret from everyone

Answer this if u r GENIUS...
I am an 8 letter word.
I am kept hidden (secret) from everyone.
My 2nd, 3rd and 4th letters spell an animals
My 4th, 5th, 6th, 7th and 8th letter make a weapon.
My 1st, 2nd and 8th letters are used for writing an exam.
My 3rd and 4th letters are the same.
Guess what am I ?
%%% .... Burn your Brain .... %%%
A Challenge for u ...

Click here for Answer

2,3,4 - ASS
4,5,6,7,8 - SWORD
1,2,8 - PAD
3,4 - SS