actstudent.org Practice Questions Reviews
The practice exercises on the ACT website are a trusted and user-friendly way to practice and see how prepared you are for the exam. They are well chosen and pretty representative of the real test (at least in my year) and they provide immediate explanations about your answer. There are several sampling questions for each section, including examples of answers for the writing section, and there is information about how many similar questions you will have to answer on the exam, and how long you will have to do it. However, the sections are not displayed in their entirety so that you can time yourself on them. But, full practice tests are available online and maybe are given at your school for free.