The source of the case, commonly known in the industry, is that when you receive a case, someone invites you and is willing to entrust you with litigation and other business that may be controversial or uncontroversial, but you don't want to appear in court. You failed the judicial examination, so it doesn't matter whether you practice or not. I suggest you focus on the judicial examination. Only by passing the exam can you be qualified for the job. A future practicing lawyer.