How to speed up a video recording on an iPhone?

I have an orchestra playing test tomorrow and I haven't practiced at all, the song is tempo 220 and I have to play mainly sixteenth notes. I can't do it and I won't be able to do it well in a day so is there any apps I could get to speed up a video without changing the video? I need to know quick, any sarcastic comments will be reported, I would just like some help please, thank you!

I really do not think that you are expected to play sixteenths at 220! Perhaps the meter is the issue. What size note is getting one beat? A quarter would be insane, an eighth would be possible, and a sixteenth note means that this would be SLOW. Get clarification on this before you continue to freak out. I'm guessing that it is quarter at 120.

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