Some or All Questions Are Presented In a New Format Questions were grouped - probably by the official Microsoft Preparation Guide categories. The difficulty of every question is known because it has been recorded while thousands of us took these tests. So, each question has a known pass rate, and a known Preparation Guide category. Combining the information about how predictive of success a question is with the previously calculated data about question difficulty allows psychometricians to choose the most predictive questions that are either harder or easier within the same test category. In this way, a smaller group of highly predictive questions on each category or area of the test can be selected.
Easy questions have small point values, and harder questions are given larger point values.
Correct answers lead to questions of increasing difficulty, incorrect answers lead to easier questions. This process continues only until the adaptive test determines the candidate's ability. This means that during a test, even though a candidate might well be able to answer many more questions correctly, the test ends when the candidate has surely passed or surely failed. As soon as the test knows that you could not possibly pass, or that you have certianly already passed, testing ends. Real exams used to provide, in addition to a total overall exam score, partial scores on the categories appropriate for each exam.