So guys today i gave my SCBCD exam. 1. too many questions from Message driven beans... 2. 1 question from timer related 3. too many query language related 4. a lot of questions on transaction attributes like what happens when it is REQUIRED, or NOT Supported in different scenarios 5. 1-2 questions related to trade-off between deployment descriptor and annotations 5. some 10 questions on security related. 6 there were quite tough questions on session beans involving one bean calling another bean and some specific requirements related to session beans.
Hope this will help.. yup mikalai notes were useful but you still need a very good conceptual understanding of EJB 3.o concepts.
I had mostly theoritical knowledge so stumpped by a lot of questions.