Hi
linhhdaoTo measure your "test readiness" in quantifiable terms, there is no other test other than the GMAT Prep that comes closer to the real test. I think 2 tests is not a sufficient number to see the trend. I suggest doing a thorough analysis of the GMAT Prep tests as well as obtaining the ESR for the real tests.
You can then analyse to check commonality in errors in the ESR & GMAT Prep, for e.g. look for concepts where you got questions wrong in both tests or pacing issues in the mid of the exam in both tests. You will have to then actively work on each weakness in isolation & attempt a GMAT prep test again.
Repeat the analysis again for the new GMAT prep test. You should be able to eliminate your weaknesses effectively if you do that.
Most importantly be honest & true to yourself while doing the analysis, sometimes we tend to fool ourselves into believing for the sake of fake comfort, since the test is just daunting or made daunting because of the hype around it.
Another thing for test readiness, i suggest, this is from my personal experience, is for every question type tested on the GMAT, you should be able to figure out the direction or steps to the solution within 20 secs or less of reading the question. If its a Quant question, you should put your pen to paper within 20 secs or less & start working towards solving the question. Similarly for Verbal, for e.g. CR, you should immediately figure out the logical fallacy used in the question & the possible answer types (both correct & incorrect ones). This will all happen very fast in your brain, but your brain will quickly recall your response to a similar question or similar situation, which you had practiced number of times before.
Our brain is more suited for responding at its best with known situations rather than unknown ones. Try avoiding the fight or flight situation for your brain & it will reward you handsomely. This is will come with lot of practice & identifying patterns that the GMAT uses.
The more i practice for the test, i see that the test is more predictable than it seems. Once you get to that kind of comfort level, your accuracy & speed will be exactly what the test demands from you. GMAT is more of a test of identification of patterns & is designed to favor someone who knows the concepts thoroughly & has practiced enough to identify its patterns. It is as simple as that.
Also while you practice, make sure your hit rate for Medium level/600-700 level questions is 100%, if you are aiming for a 730+ score.
Above advice is from my experience with the test so far, so take it with a grain of salt.
All the best!
Cheers,
GyM