Missing a prerequisite? Application already submitted.

[ace_inhibitor111]

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So, a school informed me earlier this week that I am missing one semester of General Chemistry with Lab! My mistake, my major is chemical engineering and I took a few upper level chemistry classes so I thought it would be fine. I am taking the missing coursework this fall, and my other prereqs are otherwise good. Thing is, I already submitted the secondaries for some schools so they won't know I am taking that class. Should I update them by email? Phone call? Or should I wait until I hear back (and maybe risk never hearing back)? Thanks for the help!