ok so i was playing skyrim and was trying something with the book.
i accedently found how to dupe it.
1) put the book on book shelf.
2) open and close book quickly and press "b" (xbox) which will open character menu.
3) dialogue box will open and you will be able to choose what levels u want to level.
4) close character menu and press "a" (xbox) twice quickly and the npress "b" to open character menu again.
5) close character menu and look in your inventory for book, also look on bookshelf.
(book on bookshelf will be invisable until you activate bookshelf.

repeat as many times as you want and remember to save.
if you have any questions please comment.
+rep if u want and thank the comment if u dont mind =D