For me, it was hammering the flash cards and being honest with myself for the math portions. My biggest focus with the flash cards was trying to recognize language the SOA used as a way to indicate what list to quote. It can be incredibly subtle.
For the math, it was learning how to organize my answers. For solutions using tables, I would revisit the problems until I could recreate the table in a way that made sense to me (sometimes that meant a different order than the solution, or an additional column or two to show more steps). Medicare COB and NPPBC are some examples.