Normally, people go to law school so that they can practice law. Some just do it to know the law better in relation to their other work, though it's a hard three years just for that. I've heard of people with medical and legal degrees who serve as consultants on med/legal issues, but practice neither profession. The usual thing to do would be to sign up and take the bar exam as soon as possible, so that you could start practicing and be employed. You can't engage in the unauthorized practice of law (appear in court, sign pleadings, etc.) Some state's (at least this used to be true) only give a bar exam once a year, or twice, and many have rules about how often and how soon you can re-take the exam if you fail. So the process of taking, failing, re-taking could cause a lapse of time, though I don't know if that happened here. I guess someone could have other, specific reasons for not taking the bar exam right after law school, like going into another line of work, military service, etc.
I guess if you were in process of trying to pass the bar you could do legal related jobs that didn't require you to be a lawyer. There are also some internship sort of programs where people work under the supervision of lawyers before they are admitted to the bar.