A little busy right now

I haven't posted in a couple of days. Mid terms are coming soon and I am stuck on statistics. Anyone have any tips or short cuts for understanding the following concepts?

Bi-nomials
Chi-Square Test of Association
Chi-Square Goodness of Fit
z-Test
t-Test

And the related topics?

Every time the professor introduces a new concept, I envision my PhD slipping away into the blvd of broken dreams because of one stupid class.