Choose a level, listen to the audio or watch the video and take a quiz. These lessons take just a minute to do and are designed for ESL students. For example, lesson 1027 Countries United.
Listening Quizzes (easy, medium, difficult). Why don't you have a go at this quiz? Job hunting (multiple choice).
Choose C1 level and practice, practice, practice. Try tackle War's Silver Lining, a gap fill lesson.