For timing, read these two articles and start doing what they say. Pay particular attention to section 4 of the time management article (the first section in the 2nd half of the article):
http://www.manhattangmat.com/blog/index ... to-win-it/http://www.manhattangmat.com/blog/index ... nt-part-1/You mention that you have 5 weeks till test day - just FYI, people often find that it takes at least 4 to 6 weeks to properly address timing issues (such as developing the "1 minute sense," as discussed in section 4 of the above time management article). If you aren't working against a deadline, just be aware that you might need a little bit of flexibility on test date in order to work this out.
When I'm reading the guide I understand the concepts, but on the actual test, I have trouble recognizing when/how most number properties are being tested.
This is so common for number properties that I actually had to write an article that then points to a whole bunch of
other articles, all of which address this. :) See here:
http://www.manhattangmat.com/blog/index ... -gmatprep/Re: OG problems, read the "How to learn" section of this article:
http://www.manhattangmat.com/blog/index ... an-part-2/As a general rule, it is a complete waste of time to do any problem if you aren't actually analyzing it in the way described in the How To Analyze article (linked in the above article).
In terms of which OG problems to do, when you first complete a chapter or a particular book, it's a good idea to do a couple of problems from that area right then, just to familiarize yourself with them, but most OG problems should be saved for after you've completed a book or multiple books. It's not a good idea to do a set of problems all of the same type, becaue the real test is (a) never going to give you 5 divisibility problems in a row, and (b) even more importantly never going to tell you that you're about to be given a divisibility problem in the first place. :)
So, for the most part, we want to do OG problems in random sets. In terms of whether those should be easier, medium, or harder, that depends on your current scoring level. Do a mix, but in general try to range things around how you're actually doing in that section (Q or V) overall. If you're scoring in the 75th percentile (or higher) in quant, don't even bother with the first 20 or 30 OG questions. By the same token, don't only do the hardest questions (unless you're already scoring 95th+ percentile). But do stuff in the vast middle with some lower-numbered Qs and some higher-numbered ones, and moving the overall mix up as you realize that you're getting better.
I'm also planning take a practice test each weekend for the next 4 weekends to measure my progress and analyze my strengths/weaknesses.
Don't decide in advance exactly when you're going to take a practice test. Take a practice test when you feel that you have made substantial progress in at least several of the major problem areas you identified after your last practice test. If this only takes a week, great, but if it takes 10 days or 2 weeks, don't force yourself to take a practice test after only 7 days simply because you put it on the calendar. That's a waste of your very valuable study time - you already know what you should be working on!