The experimental section can be either verbal, quantitative, or analytical writing task. This section contains a set of new questions that ETS is considering to use in future. Based on the time the aspirant takes to solve these questions, ETS classifies the question as easy, medium or difficult. Thus the name experimental is truly justified as the experimental questions are being tested on the aspirant for which no marks are awarded. It is difficult to identify which section is experimental, since it appears to be identical to the real section. Fortunately, this section is not adaptive, which means the difficulty level of other sections will not be affected by the performance in this particular section. Paper based GRE has no experimental section included in it.
There is a way to identify the experimental section if it turns out to be analytical writing. Then for issue task only one topic will be given. Also, analytical section is always the first section in GRE. The aspirant can thus know, that the section is experimental and can devote less time for this particular section. There are times, when instead of the experimental section, a research section is provided. In this case, the aspirant can skip the entire section. Also, there are times when no additional section is provide to the aspirant. But this happens only for a lucky few aspirants others still have to give the experimental section to succeed in GRE.
There is no fruitful way of identifying the experimental section, so the aspirant is always advised to attempt all the sections in a similar manner with a clear focus to succeed in the prestigious GRE exam.