Stoichiometry Test and Iron Lab

Before we took the unit test, we did the Copper Chloride and Iron Lab. This lab consisted of adding Copper Chloride to an iron nail and watching how it transformed the mass of the nail. The copper chloride quickly rusted the nail, and left it around 1 gram lighter in mass. We then had to figure out if we used an iron nail that was 3+ or 2+ . Ours ended up being 3+. The real focus here is the test though. Once again I felt somewhat confident coming into the exam, but once I start the test I just seem to forget everything. I don't think it's possible to get a worse score than I did on the last unit test. I am nervously awaiting the results.