I have been talking to a lot of people who have taken the GMAT and I have noticed there are certain habits people inexplicably form when practicing and will usually fair poorly during the actual test if these behaviors are not addressed. Although I did these things early on, I found that changing my study habits was one the most important factors I needed to improve. Frankly, I did some of these things to subconsciously convince my self I would do well and reduce test anxiety. I was guilty on all counts of the following:
1. Adamant stance that the test does not require large amounts of rote memorization. ie, relearning the times table if you are rusty, becoming familiar with number properties - very familiar - intimately familiar.
2. Pausing CAT exams to work out problems. I used to do this all the time. I just couldn't let easy but laborious questions go.
2a. Have not learned to time your self or retain some sense of time interval per question for the verbal and quant sections.
3. Applying to schools before taking the exam. No one likes to admit to doing this, but it happens quite often. Take the exam when you are ready, then apply.
4. Will not accept that there are certain questions you can and can not answer. Just because you almost obtained a math minor in college does most certainly not mean you need to work out every question in quant or you will forever live second guessing your intellectual faculties.
5. Use a coupon to buy a flashy prep guide with a studious student on the front of it and use it exclusively to study for the entire exam (I used OG 12 too - I wasn't completely green). Ironically, some of the self-prep programs discuss fallacies in logic and use these same fallacies to convince test takers into believing that since the exam does not cover subject matter outside a high school education it is easily beatable and that they should buy this particular guide. Although all guides are useful, they shouldn't be your only resource.
6. Have not yet become a member of gmatclub. You may have been a former Special Forces Operator working alone in the vast expanse of the desert, now retired and trying to get an MBA but everyone needs help at one point in time. No matter what your background is you need to read success and failure stories. This test is hard and you shouldn't do this alone.
I hear these all too many times from people (friends of friends, friends of my parents, etc...) who have taken the test two or three times. They always say "haha, yeah I used to do that too. It's funny you should mention that." So just out of curiosity, if any of you happen to remember some poor study habits of your own, please feel free to share. I think it would be important for new test takers to understand what it takes to actually do well and in essence use this post as a "diagnostic" for the long treacherous path ahead.