After a week of intensive reading after working hours, finally I got it through today with 92%. The preparation process was tough for me as the scope seems to be very wide. I studied mainly using the official materials from Adobe, which include:
Adobe Flex 3 Developer Guide
Developing Adobe AIR Applications With Adobe Flex 3
BLAZEDS Developer Guide
I didn't study for ActionScript programming as I am coding it in my daily job. ;-)
Looking forward to have a great weekend, Cheers!