Adaptive tests are on the rise. These usually employ a ratchet function that increases the level of difficulty when a question is answered correctly, and presents easier questions when a question is answered incorrectly. The test then presents every candidate with the same number of questions in the allotted time, just scores easy, medium, and hard questions with different number of points each, and the final score is meant to represent one measure of the competence of the candidate in the area being tested.
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The test there gives you 5 questions at a time, and then gives you an indication of the total time you took to answer the questions as well as how you did when compared to the rest of the people who took the test. Of course, as you progress through the test, being adaptive, there will be a bump up or down depending on whether you answer a question correct or wrong.
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The tests are 5 questions each so you can fit at least one into your busy day. It pulls randomly from a pool of 1000+ questions, so the likelihood that you see a question repeat is small - depending of course on how many tests you take on the site. The hard questions can be really hard though, so be prepared to focus, spend some mental energy, and work through it.
In another post in this blog, I discuss top 10 tips on how to prep to do well on the quant sections of competitive examinations.
Incidentally, if you are looking at going to interviews for a quantitatively focused job, this might be another resource that could be useful. Here's a youtube video where ChiPrime solves the problem:
A circle C of radius R is such that its center is inside a square of side 2R. The smallest and largest probabilities of picking a point in S such that it also lies in C are?
There are many other problems relevant to GMAT/GRE Quant prep that are solved in that channel as well - some easy, some not so easy, just like you're likely to see on the test. Good luck!
