Becoming a prosecutor is, in a lot of ways, similar to becoming a regular attorney. There's no requirement for an undergraduate degree. You may take up any major that betters your habit of reading and understanding concepts. After that, prepare for law schools to earn your J.D. Degrees. Continue on and complete the three-years of law schools before stepping into the bar exam. Once you pass this exam, you're legally qualified to become a prosecutor. However, it is advised to get some training and experience before stepping into the courtroom on your own.