Hi lukacsdepereny,
Unfortunately, there is no easy answer to your inquiry, as different students need different guidance on the GMAT. Before I provide some specific advice going forward, however, I just wanted to address one misconception in your post.
Manhattan GMAT currently offers 8 Strategy Guides, not 7. If you have the old guides, then you might have the guide that combines Critical Reading & Reading Comprehension into one. Now, these books have been split up into two separate guides (check the out at our
store). If you need help on the verbal section, it would be particularly worthwhile to pick up these new guides since they really do provide students with a clearer idea of these sections.
So, in terms of studying going forward, the 17 subscore in the verbal section tells me that going with a self-study option may not entirely work out. You seem to have gaps in your verbal foundation, and you might require guidance from an Instructor. I would take the next week or so to intensively review the Sentence Correction book and test yourself to see if you genuinely improve in this area. If not, then it would be worth it to look into one of our
Prep classes. Granted, hard work generally does pay off, but if you want to significantly improve your score in the next two months, you would most likely need help from someone who has teaching experience and can convey verbal ideas in a clear and concise manner.
Hope this helps. Please let me know if you need anything else.
Best,
