I have had several principals over the years who insisted that teachers give students as much time as they need to take tests (primarily due to parental requests). Some students even prefer to REALLY take their time and then ask to take the tests home to complete (where they can get assistance from parents, siblings, Internet, etc.). I know some students work slowly and need extra time, and I don't really have a problem with this, other than that as the teacher, I have to supervise them beyond class time. It also tends to serve as a breakdown of proper class time management. Some standardized tests are untimed, but students will face MANY timed tests in college and beyond, and they will find that most college teachers will not make exceptions for slow test-takers. In such cases, they will not be able to have their parents run interference for them, so my suggestion is to prepare properly for tests and do the best you can during the time allowed. It's great preparation for the outside world, where job requirements regularly have time restraints and where bosses won't be quite as willing as teachers to provide more time (and loss of profits) for slow-working employees.