I too am studying for the RHCSA.....and while it IS tough (SO different from when I had to study for Windows 2000 Server Administration certs!) I wonder if the fact that Red Hat is about to release version 7 if the 6.x exams are still going to be valid?...and if so..for how much longer?
http://www.redhat.com/training/certifications/recertification.html
"RHCSA is considered current for 3 years from the date it is earned."
As RHEL 7 is soon to be released you should take exam soon or take exam with RHEL 7
-- Eero, RHCE