DeDrm plugin from Calirbe didnt work for me.
But i found This this works so if anybody needs it.
1. install active python
2. Unpack that zip file and Now go to folder
DIR :\tools_v5.1\tools_v5.1\Other_Tools\KindleBooks
3. run KindleBooks.pyw there
and then select the amw book file and there you go you can now import that book into
Calibre without problem and do what you want with it there, its decrypted.
Hope this helps!