I can't help with QR (got a 17), except to say that there are strategies out there for all the common question types. You just need to get used to answering all those question types and brush up on your algebra, number properties, geometry and such. I didn't do those things though (hence the 17), so don't take my word for it.
On the other hand I got a 25 in reading comprehension, and I've always felt that it is by far the easiest section on the whole exam (except certain parts of the PAT). I think the key is that you have to remember that all the questions relate directly to the passage, and try to leave your interpretation of the content at a minimum. By this I mean that if they ask "according to the passage, what sorts of activities may increase risk of cancer" and give you choices of a).drinking too much milk b.) excessive suntanning c.) smoking, and d) exposure to x-ray radiation; the answer isn't always going to be smoking or the like because they might not have mentioned smoking in the original passage, or if they did they didn't actually accuse it of causing cancer. Instead they might have said something about x-ray technicians and cancer, making that the correct answer, even though everyone knows that suntanning and smoking can also lead to cancer. 99% of the time, the answer they're looking for is in the passage almost word-for-word, so don't settle for something that just sounds "kinda right"
Also, you don't have to actually understand the passage to answer the questions- this is somewhere alot of people mess up because they read and re-read the passage till it all makes sense when all you need to know is remember where everything was discussed. For instance if you can just remember that 2/3rds of the way through the author talks about or those keywords you see in the question/answers, you can just read that part carefully until you see exactly what the questioner is asking you to find. Alot of times they'll throw at you these huge ungodly words that make no sense to you, but 9 times out of 10 you don't even have to know what the word means, as long as you know where the author used it.
To that end alot of people actually make content maps for their passages using their scrap paper. You just number the paragraphs and use a few words to say what that section talks about or what keywords they use. That way you can find the relevant section for each question quickly, rather than hunting it down and wasting time.
The hardest questions you'll ever get are the simple ones, like "which of these statements would the author be most (or least) likely to agree with?" These are hard because there is no one sentence you can go back to for your answer, so this is the one type of question you should be careful to think about the first time you read through, since that first pass gives you the best overall picture of the passage's content. Also remember that the question is looking for the author's opinion, not yours, so never let your own knowledge/opinions affect your answer.
One more really important thing is to get used to the format they give you on the actual exam. This is what screwed me up the first time I took it, giving me my all-time low score of 21 for that section. The problem is that you can't orient yourself in the passage very well because you have to use the little scrolling window, and thus only get to see a little bit of the passage at a time. The second time I took it, the scrolling window was bigger, but it was still a nuisance. What i found helped for that was using the position of the scroll bar to make my mental map. When the author talked about something important I'd just remember "they talk about symptoms and latent period when the scroll bar is 2/3 of the way to the bottom", then when I get a question about how long the disease's latent period is I can quickly get to that section. Just remember that memorizing the passage is unnecessary when you can remember <i>where</i> everything was mentioned.
Those are the basic points that come to mind that I think most people mess up on. Personally I don't understand how anyone misses more than one or two questions per passage because 95% of the questions refer back to the passage word-for-word. They always through at least one or two curveballs that have some ambiguity to them, but if you focus on the ones that have a single definitive answer you'll do great.
hope that helps, sorry if I rambled to much
~Will
