Should I guess on the act?
The short answer? Yes! The long answer? Yes, always!
As you've seen, ACT scores are only based on the number of correct answers. But questions you leave blank and questions you answer incorrectly simply don't count for or against your score—unlike some standardized tests, the ACT doesn't have a wrong answer penalty. That's why you should always guess on every ACT question you can't answer, even if you don't have time to read it; you have a statistical likelihood of getting each question right just by answering! Though the questions vary enormously in difficulty, harder questions are worth exactly the same as easier ones. So it pays to mark the hardest questions to return to later and to guess on them, and spend your time gaining all the easier points you can find first.