if you "play by the book" then you should be changing gears,
if thats not in your book, I suggest finding other material.

How do I study, as apposed to what to study

early in the morning
the worst time to do any reading, that you want to absorb shouldn't be late at night, or when your tired, or got plans to go do something.

be organized, start from reading the basics till you do understand before going onto other parts of the game. No point knowing emplied odds if you don't know what draw is.

Find a Proffesional player, mimic their style, then find another player.
Why?
Getting the most value at any sitting is not about how you play, its about how others at your table play. You need to play to the styles that take advantage of those players at the table.

table is tight, you play loose/aggressive
table is loose, you play tight/passive* (depends on trapping strategy)

The more you know, the more you know