Stop in for a cup of coffee

Well, I got news today about a prior job that I applied for. Not the one with staffing problems, this one I interviewed for back in Dec. I made it to a 2nd interview. They told me there will be a writing exercise with follow up questions about supervisory and leadership. Man, I have frickin butterflies now. I have no idea what a writing exercise interview even is... Not to mention, that they will also be calling my references. Now I have to figure out how to inform my 2 current Supervisors, who are on that list... Any ideas?
just be honest