I'm in a similar situation in that one section (BS) has been weaker than the others in practice tests, and I'm trying to get a 2-3 pt jump in about a month. If your serious about increasing your study hrs, EK's audio osmosis and Goldstandard's flashcards are essential imo, since you can use them to study during otherwise unused time (e.g. while commuting in your car, waiting for the dentist, etc)