Just when you think you are getting the hang of these Actuarial preliminary exams you might run into a brick wall with Exam 4/C. This exam is difficult because it is 3.5 hours (the longest out of all the prelims). It also tests a potpourri of items from loss models (i.e. frequency and severity) to fitting parametric and empirical models to Credibility to Simulation. I found it very helpful to use the TI-30XS Multiview calculator because it has a Data Table function. This allows you to put data into a table and calculate statistics off this table. See if you can learn how to use that function just in time for the exam.