刚听说GMAT考试中存在试验题（Experimental Questions)....

babybearmm

Manhattan手册上面说的，Manhattan的老师上课也这么讲，可我以前都没看cd这里说过，不知道是不是我没发现....
Source:
http://www.manhattangmat.com/pdf/gmat-uncovered.pdf

The GMAT includes what are called experimental, or nonoperational, questions. These questions do not count at
all towards your score; instead, the test-makers are testing these questions on you in order to determine the Item
Characteristic Curves (among other things) so that these questions can be used on future tests. (See the discussion
on algorithms, earlier in this document, for more on Item Characteristic Curves.) Up to ten of the questions in each
multiple-choice section (Quantitative and Verbal) may be experimental. (That means up to 25% of the questions
that you answer in each section do not count toward your score.)

There are two big drawbacks to this. First, you have no idea which questions are experimental. You have to assume
that any question you see counts; even very experienced test-takers cannot tell which ones don’t count. Second, the
experimental questions don’t have any assigned difficulty level, so the algorithm doesn’t know that it’s about to give
a very high-level test-taker a 10th percentile question, or vice versa. If you’re suddenly given a question that seems
much easier than the previous questions, that doesn’t mean you’ve bombed the test; the question may be experimental.
By the same token, if you suddenly see an impossible question, don’t despair or celebrate; again, there is a good
chance that the question is experimental. Try your best within the expected timeframe for a question of that type
and then move on.

babybearmm

所以我想很多JJ中说出现生题，莫非就是这种Experimental Questions？

jolene91

因为貌似也没办法判断是不是实验题，只有把所有题都当做算分的来做了

kaitlynyl

我好像理解错误了。baby说的实验题是有可能不算分的题目呀~
那下面内容baby选择着看吧。~~~
我今年1月做测试题的时候，
1.发现有明文密文转码题，选项为双选，左边一溜右边一溜，问的是对应密码转换的。
2.阅读有3个标签的那种题，第一标签是文章，第二标签是柱状图，第三标签是地质成分分析的那种图，我记得很清楚因为把我雷到了，当时因为刚答完题想迫切知道考怎样，就没好好做。这篇阅读是讲CO2和什么东西反应的，然后还有地质上的一些知识。选项都是双选，左边一溜右边一溜。问题有问CO2和什么反应什么的，我当时头轰隆一下就胡选了个。


给baby做参考。毕竟1月份的事情了，印象比较深刻就是双选和图表太多。阅读基本都是2-3个标签的。
至于实验题的话，我觉得要给出背景的。因为题目都特别长特别多，半小时之内让我全做完，我没有那么多时间看。所以baby好好准备，给出背景的话，就不怕了。我自己分析觉得是在考阅读能力和综合分析能力。这两点baby都没问题的。baby加油哦~

babybearmm

谢谢kait亲，你真体贴~~

啊这是我刚复习GMAT发的贴子了，现在我清楚啦。确实是有experimental question，我指的是在每个session (verbal, quant, & IR)里面，都有一些题目是不算分的，是GMAC根据你的答题情况来帮他们检测这个题目的一些参数，确实像Manhattan所说的。

thouzand_

谢谢分享;
除了实验题之外,我听Helr前辈说过,我们gmat 的verbal 部分最后分值与所做最后一题的难度系数是对应的.