The student services office requires a round trip ticket to be purchased because you need to include a copy of the round trip ticket for a student visa. I'd also bring a copy of it to the airport while traveling just in case you get someone in a bad mood that will ask or give you a hard time. But the other posters are right, if you are a first semester student in January, your exam will be on April 16th, meaning you can fly home on April 17th.
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