RHCSA is an entry-level certification that focuses on actual competencies at system administration, including installation and configuration of a Red Hat Enterprise Linux system and attach it to a live network running network services.
RHCSA exam is not difficult, but more tricky. The exam is graded via automated script which checks for specific things. For example, if you were given a question regarding cron jobs for users. You can either put in in the master crontab, or in that specific user's crontab.