Sight reading on auditions

Hey there!

I'm auditioning for an arts high school tomorrow and one of the requirements is sight reading for both drums and mallets. I've been playing for quite a long time and can read perfectly but sight reading isn't really my thing. I've been studying exclusively sight reading for about a week, but I'm still stressed because I just don't know what to expect. How is sight reading normally on auditions? Do they give you 15 minutes or so to check the sheet music (I know they do this on Berklee) or is it on the spot?