Alternatives to Concerta medicine, either stimulant or not, as a one t

Hello,

I'm going to be taking the SAT the next day, and unfortunately, I had to drive a ways to make it, and stayed overnight. Unfortunately, I forgot to bring my ADHD (Concerta) medicine with me. Is there any alternative medicine or anything else that would help relieve symptoms for the day? I heard that coffee/caffeine works with some and not with others. Any information or suggestion would be extremely helpful.