Hey vlad - thanks for the follow up, and good for you wanting to get an early jump on things! I'll see if I can clarify a bit, as I know you want to maximize the time available to you pre-course but may not need to commit to the full Trilogy in order to do so.
I'd start by taking a full, timed practice test. The June 2007 exam is free online if you want one you can get your hands on quickly (and if you're already enrolled in the course and have access to your Online Student Center there are other tests in there that you can take as well; just avoid the four in-class tests that are listed as Tests 1-4!).
Once you've taken a test and scored it, review your results and performance and from that you'll have a much clearer sense of your strengths and weaknesses (natural abilities), meaning you'll have a good idea of precisely where to start building the most crucial pre-course foundation. My suspicion, if you're like most people, is that Logical Reasoning is going to be the most opportune section type to begin with, in which case get a copy of the 2017 Logical Reasoning Bible and begin working through that! Not only will it instill in you an incredibly strong set of fundamentals that will serve you quite well once the course begins, but it will also lead to improvement in both LG and RC, as many skills overlap. (Added bonus: because that section type is half your score every individual improvement ultimately counts double!)
You can use the Study Plan of your choice to help you organize your weeks with whatever materials you pick up so that it's always clear what you should be doing from week-to-week as your skills improve, and if you want to supplement that pre-course prep with other guides—LG Bible, say, or a Workbook—those Plans make it easy to do so, as well.
Lastly, remember that the course is designed to be entirely sufficient for nearly everyone, meaning the work you do solo beforehand can be a big help (both psychologically in feeling productive, and in reinforcing the basics upon which the course will build), but the real crux of your prep will occur once the class kicks off. So tread somewhat lightly until that point; you don't have to sit entirely still, but you may not need to put in tens of hours a week yet either
My two cents!
Jon Denning
PowerScore Test Preparation
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Post #1
I'm going to refer you to the below posts, which should address your question