During the week, focus on practice questions, doing one or two question types a night. Use the strategies in the PR book and the practice questions in the OG 11
book for this (rather redundant to have both OG 10
and 11, and 10 is out of date). Keep an error log
as you go.
Spend perhaps 45-60 minutes doing practice questions of one type, then score them and log the errors. Then spend another 30 minutes working through the fundamentals or strategies that were lacking. Then take a break, and switch to another question type. Do this each night on weeknights.
Each weekend, take a full practice test. The GMATPrep and Princeton Review
tests are the best ones because the questions and scoring are most like the real thing. The PR tests have answer explanations as well, so you can review and track your errors.
Review your errors on the test and compare them to errors you made while doing practice questions. If you're making the same types of errors, you likely need to work more on fundamentals. If you're getting questions right in practice but not so much on the timed tests, then you need to work on test-taking strategies.
If you are diligent in tracking and analyzing your errors, and work hard to correct them, you can do even better than you expected!
Hope this helps.