What does a supervisor first see about you? Two things: your resume (or CV) and your cover letter. Learn to write both in the Writing to Get the Job course.
Go to your job interview with confidence by learning what the questions will likely be, how to answer them the best way, how to dress, how to comport yourself (body language), and other topics in the Job Interview course.
Polish your pronunciation and increase your fluency in the Pronunciation course.
Learn about using small talk, setting up and conducting meetings, disagreeing politely, negotiating, and selling in the Speaking for Business course.