I went through SCJA.de ebook where the EJB and Applet questions are in depth. But in your book basic topics are covered.
Should i study in detail the EJB's .If i should study in detail may i know which book can i refer.
What type of EJB questions will be there in SCJA exam?
You are indeed fine with Cameron McKenzies info given in his books. Personally, I also got my hands on EJB before the exam, just to get a picture about it. I went to a online tutorial and basically set up a free application server and deployed a EJB .. kind of the 'Hello World'-EJB