GoodFellas can help advanced learners become more confident with fast and natural English. Some conversations move quickly, so learners may need to listen to certain parts more than once at first. The vocabulary is not overly technical, though it includes enough variety to make the practice meaningful. Some parts may require more focus, but the main story remains easy to follow. For learners around B2/C1, this can be a practical choice for getting used to faster spoken English.
