Do I have to appear and testify in a court case if I have been subpoenaed?

Question Details: I witnessed an accident over a year ago but I cannot recall the details now. The lawyer for one of the parties has subpoenaed me to testify in the civil case. I live 5 hours away, am a full-time college student, and work 2 jobs. Since I cannot recall the details and cannot afford to leave, can I just ignore the subpoena?

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