How can I stay awake to study?

I have a Law exam this Wednesday and I have still got a lot more to revise. I want to stay awake so I can pack in as much revision as I can. Would coke be useful to keep me awake? Will that affect my revision in anyway? It`s just, I don`t drink coffee. Someone said green tea but will that even keep me awake?
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FFS! I`m not talking about any sh*tty drugs. I was talking about COCA COLA. I don`t want any other tips either unless its to do with staying awake and coca cola! God!
How can I stay awake to study?
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