Although you may collaborate and share your work with other students, it is important that you write your own papers. Plagiarism is the unacknowledged ore insufficiently acknowledged use of words or ideas of another.
Accurate citations are especially important in academic discourse.
Professors, as a rule, value scholarship highly. Of course, cheating on exam is is out of the question. Nor should there be any need, because we will have worked with the concepts in class and you will all receive elaborate study guides before each exam.