Could anyone help me to find out what is the diffrence between the old book abd new book (only chapter 2,3,4). I purchanged the new book but later on i got to know that i can still appear for the old exam which means i need to read only chapter 2,3,4. I was wondering if i read the chapter 2,3,4 from the new book and appear for the old exam. Will this work OR i need to buy old book and read the material???