Do all the questions have to be answered on the exam or can some answers be blank?

English language exams:

You must answer all 100 questions for your examination to be scored. Adaptive testing does not allow the tester to go back to a question once they have moved on to the next question. 

In a computer-adaptive exam, questions are selected for candidates according to the assigned domain percentages indicated in the exam content outline (opens in new tab). Within each domain, questions are selected to match the candidate's ability. What this means is that a candidate’s correct or incorrect answer to a question determines the next question they receive. If a question is answered correctly, the next question selected is more difficult. If a question is answered incorrectly, the next question selected is easier. Because the correct or incorrect answer to each question is used to select the next question, candidates are not able to change their answers to previous questions. 

There are many benefits offered by computer adaptive testing, such as access to year-round testing, no exam registration deadlines, preliminary results provided at the test center, and expedited exam results delivery to state licensing Boards (upon candidate request). In addition, computer adaptive testing allows for more precise measurement of candidate ability using fewer questions than traditional linear exams. This feature allows adaptive exams to be shorter and therefore less expensive for candidates.