Just took it. Don't want to jinx myself, but that was NOT a super difficult exam. I mean, it was written like crap at times, and there were a few so-called low-yield topics they like to repeat for some reason. I finished without feeling beaten up or tired or even aggravated for that matter (and that's unexpected). Sitting down to study for the USMLE right now in fact.
Anyhow, besides knowing your facilitation levels/innervations, I'm not sure there is a "high yield" approach to this exam. I wouldn't go crazy studying Savarese if you did ok in OPP class/lab. COMLEX is kind of random. Loaded with one-liners and auto clicks at some points followed by long stretches of the WTFness and "what-are-you-getting-ats?" . Sort of a cheesy and somewhat laughable exam IMO (with an interface that my original NES could outdo). They need to kick this thing to the curb and make everyone take the USMLE. The powers that be should be embarrassed of it IMO. Glad I'm sitting for the USMLE in a few days.