Yes, although we strongly recommend that you do not deliberately interrupt the test. After the interruption (max 1) you must log in again using your email address and password. The test will start automatically from where it stopped. If you interrupt the test a second time you will have to go back to the beginning and start again. This is because every time you stop the test you lose the mark for the question you were answering. Two interruptions mean you lose 2 marks: too many for the result of the test to be valid.
Yes. You can take the listening comprehension part of the test during one session and the grammar and vocabulary part of the test during another session, which must take place no later than 10 days after the first session.
No. The time taken to complete the test is recorded on the system database but your score depends exclusively on how many questions you answered correctly.
Yes. LTEST is an adaptive test which means that it 'adapts' the difficulty of the questions according to the responses you give. Each question is automatically selected from a large database of graded multiple-choice items according to whether you gave the right or the wrong answer to the preceding question. That is why the questions are different every time you do the test.
You can only interrupt the test once. A second interruption zeros your score, so you have to start the test from the beginning again.
There are 24 questions on the first part of the quick test and 24 on the second part. Because the test is short, your score on the second part of the quick test can't be reliably predicted from the result of your score on the first part. Because there are more questions (50) on the first part of the full test, it's possible to make a reliable prediction of the score you are likely to get on the second part, so fewer questions are required (only 40). In fact, the system excludes questions which are likely to be too easy or too difficult for you based on your score in the first part of the longer test.