Honestly it all depends on how retain the knowledge that you read and take notes on. A lot of the members on the forum will tell you that is takes roughly 2 weeks or more for a lesson, chapter, etc. to actually sink in and understand. Also you will read alot of the top scorers suggest no more that 2 hours a day. I personally don't believe that, then again I am younger than most members here, and still attending school. So I feel like my endurance to study for long periods of time is much higher than the average member.
Kaplan books are suppose to be great resources for studying. I personally have not used them, but from what I understand they are amongst some of the top books to pick from, while studying for GMAT.
Keep drilling using the OG review, combined with your error log. Remember do not memorize how to do a specific problem you have logged, but rather memorize the steps to solve it. This way you will allow you to apply it to the test.
Also go ahead and get yourself some flash cards they are free on the web either here at BTG or through Manhattan GMAT:
BTG:
https://www.beatthegmat.com/mba/free-gma ... flashcards
MGMAT:
https://www.manhattangmat.com/gmat-flashcards.cfm
I use the MGMAT because they seem to be a bit more difficult. do these for at least an hour a day. Focus on those weaknesses and you will be on track to improving your score, but don't forget to keep your strengths fresh you wouldn't want to forget them on test day!
Best of luck bud, your doing just fine and remember to think: Just how proud you are where you are today versus where you have started.
If your going to make the conscious decision to something, then you gotta either do it or not do it - it's as simple as that - Travis Rice