If the beta test is anything to go by this exam will require quite a bit of work to pass. This is reflected in the pass score which is set at a lower than normal 60% (SCNA pass level is 70%). I scored 66% on the beta test - the beta had roughly 150 questions so I am happy with that.
About the only hint I can provide without giving the game away is that this is a Sun certification so make sure you are prepared for the Solaris specifics like the Basic Security Module (BSM), Role-Based Access Control (RBAC - overly complex? reminds me of setting up serial ports and modems) and ACL's.
If anyone can think of a good abbreviation for Sun Certified Security Administrator - let me know.