In August 2014, I published a post about my experience with the CISA exam and the required experience. Even 3 years later, it is still the most popular post here and not so long ago, I was always seeing more requests after the exam dates.
Update: I published a new post with the most frequently asked questions on this post.
Back in the summer 2013, I was interested to pass the CISA exam even if could not obtain the certification without experience. This was a way for me to demonstrate my interest in IT audit to future potential employers.