Benjiko

Don't get too bogged down with calculations that are unlikely to be on the test. The most obvious example off the top of my head is skewness.

That doesn't mean ignore skewness, but I highly doubt you will need to know the formula for it.

Make sure you spend the most time studying sections that WILL be on the test. You are going to feel pretty stupid when you get <70% on ethics because you were too concerned with calculating kurtosis.