As the exam is in two days, your primary focus should be getting a good night’s sleep on Tuesday night and being well rested. Personally I wouldn’t be doing more at this stage other than looking at formulas and trying to memorize whatever remaining check list items you have.
If you want to work a couple off the beaten path computational topics, the two oddballs that I think are most likely to appear on the exam are computing DIC given some data and a sample from the posterior, and computing R-hat given some summary information, much like problems 21 and 23 on my practice exam. My thinking here is that there aren’t many computational things that can be asked about DIC / WAIC, and they asked about WAIC last sitting so DIC seems likely to come up this time. Likewise, with computational tests about MCMC convergence, they can either ask you to compute n_eff, which they did last time, or R-hat. Just remember to take the square root at the end of your R-hat computation, which I forgot to do when writing the solution.
Whatever route you take, good luck Wednesday.
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