I got a few brainstem lesions...but I mean consider that questions can be all along the spectrum of difficulty. For some reason I had several cross-sections (one MRI of the midbrain, one slide of the midbrain, one medulla slide) and I had an angio of the circle of willis. They were all pretty straightforward. I think it's worthwhile to read HY neuroanatomy and by all means know FA, but don't let the ridiculous detail that HY gets into at times get to you. Skim over that and make sure you know nuclei, tracts, laterality, wiring patterns.