Once you finish your LL B, you cannot just practice law if you do not fulfill other qualifications that the country's legal system requires. For most nations, the LL B is a core degree but practicing law would involve passing the licensing exam or bar exam. This guarantees you possess the applied and ethical skill to represent a client in cases.
Besides the licensing exam, there may be a requirement in some areas for a certain amount of practical experience or internships with a law firm before one can practice on their own. The bar exam covers different subjects in law, such as constitutional law, criminal law, civil procedure, and legal ethics. After you have passed the mandatory exams and fulfilled other requirements in the local jurisdiction, you will be entitled to practice law there.