i pass the exam yesterday with 81%. thanks, the forum is very good place to study, i cleared many troubles during the exam prepearing from the forum. i will try my best to answer questions on it and get the help too. there is some points must to know for who want to have the exam: 1. the thread is very very important, you must know it and the synhrionzed clearly. 2. the io is important too. 3. another acepts is easy and it is ok if you know the base knowlege.