Hi! For some reason, your first two attempts got caught in our spam filter—not sure why. The first time, it may have been because you had a link. And then maybe the second time was because you posted very quickly after the first time? Anyway, your third try got through!
(I did also see the first two—they were waiting for me to approve. But I deleted them because they were the same as the one that did get through.
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Oh, that is unlucky that you got more of your weaker question type and not your stronger one. :/ I am still hearing that EMBA programs just want to see a 150+. They're not as hung up on the "higher and higher" scores trend that we've been seeing for years with regular MBA programs. The EMBA programs just want to know that you have the needed skills to be able to do well in their program.
But I would also just ask the schools to which you plan to apply. They like to interact with interested candidates, so they'll be happy to answer your questions. They likely won't give you a super-direct answer (they're usually not just going to say "yes" or "no"), but you'll probably be able to read between the lines. If they say something like, "We encourage all candidates to score 150+"and they don't say anything else / don't seem concerned—well, you have that score, so great. If, on the other hand, they say something like "We are looking for a minimum of 150; a score of 155 is considered a strong score"—then maybe you try again to see whether you can get a bit closer to 155.
I'll also add: It's good that your Q score is 11. I have heard a few schools specifically say that they want the Q score to be in the double digits.
(Note: All of the above assumes that you are not applying to a "regular" full-time MBA program, some of whom now take the EA. Those schools do seem to be looking for higher scores.)
Re: percentiles, I have specifically heard the head of the EA at GMAC say in a presentation that a 150 is about the 50th percentile. He did not give out any other percentiles (and he indicated that they don't have plans to release any percentile tables or other info about percentiles). This was last October, so it's possible that they have also released info about 155—if so, I haven't heard it. (I last spoke with the EA head in late April of this year, but we didn't talk about percentiles at all—we were talking about the EA Online!
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Re: MSR, I agree that it's still a good idea to leave those ones for the last in that section. And (if you take it again) when you go to take it next time in the testing center, chances are you won't get that unlucky again—you'll probably see some tables next time.
Next: When someone does see 2 MSR sets on one exam, it's almost certainly the case that one of the two sets was experimental. You don't know
which set—but even if you get all 6 wrong, you're really only getting the three MSRs wrong that you'd already planned to get wrong (since the other three won't count). So you could still keep to your plan to bail on MSR.
Bailing on MSR (whether you get one set or two) does mean that you only have 6 questions on which to earn points (assuming that you don't have just one MSR and that it is experimental). So if you make a couple of careless mistakes or just see another difficult problem or two in those remaining 6...you can see that it wouldn't be that hard to drop below 10 on IR. (That's especially true if you do try those MSRs and use up brain energy and time that could be better spent on other problems.)
So I would assume that you *might* choose to do MSR—but only if you think the topic / information looks okay to you. You might also decide that you will do some but not all of the problems. For example, you might see that one problem requires you to use information from all three tabs, so you bail on that problem. But then another problem requires you to use information from just one tab, and you're okay with that tab, so you answer it.
It's also not unusual for MSRs to include tables of information and you like tables. So if you see an MSR with a table, consider answering questions that involve the table. In that case, think of the problem as a table problem with a paragraph of info explaining the table—that paragraph might just be on a different tab, that's all.
The new IR guide that we published in Sep 2019 was updated, yes—as you noted, we added strategy information specifically for the EA (mostly around time management, bailing, marking and returning to problems, etc). Most of the strategy is stuff that I also put in my articles on our blog, so if you're familiar with those, you're probably okay.
We did also add some new problems to the book and more information / strategies about how to solve the different types of problems. If you're looking for new info / strategies about all of the problem types, then it could be worth getting the new book. But if you're really just looking for more on MSR, I don't know that I'd buy the whole book just for that one problem type (especially given what we discussed above—that you're still probably going to bail on most MSR and only consider going for the topics / types of info that you're more comfortable with).
Go talk to the schools first before you decide anything. Maybe you don't even have to take it again.