What can I do now to insure I have a job when I graduate?

I’m currently in my first semester of business school and still have time to pick my major. The thing I’m focused the most on is making sure I have a job when I graduate. I’m deciding between accounting, finance, or/ and supply chain. I am also open to double majoring but not sure if that will make me more marketable or if I should pursue a higher degree. Should I focus on networking and career fairs? Are internships important?

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