No, students do not need to register. To make the process more efficient for teachers and students, Intuitivo works through links. In other words, when you want your students to take an assessment, you simply "publish" that assessment, choose the settings you want, and at the end you will receive a link. That is the link from which the students will access the assessment, so all you have to do is copy it and send it to your students by any channel.
Don't worry, by accessing the link, each student will identify themselves with their name and email, or through their Microsoft/Google account, so you will always know which student each answer belongs to.