Our program used to pay for such review courses; however, due to the state of the economy in recent years as well as financial cutbacks made by our hospital looking for ways to save money, they no longer do. There are some programs that do fund for such review courses, just depends on which one and how well-funded they are.
I haven't taken boards so I may not be the best source, but based on stats, the Pathology board pass rate is lower than fields such as IM and FP which is around 97-98%. Don't know how Path stacks up against other specialties.