With CodeGrade’s exam mode you can automate when an assignment is visible to students and send an email to students with a link to the assignment, with which they can then log in to the assignment. When logged in via such a link the student will only have access to the course of this exam.
In exam mode all the usual assignment tools are available, such as the rubric for grading, or the plagiarism checker. You can even set up an AutoTest configuration to give your students continuous and automated feedback during the exam.
For exams you do not configure a deadline, but rather a start and a duration. Set the start by selecting a date and time in the “available at” field. At this moment the assignment’s state will switch from hidden to open automatically and students can start submitting their solutions, for the set duration of the exam.