This policy will present the questions in a different order for each student, as well as reorder the questions for each assignment attempt.
Your students will be less likely to share answers with each other, won't be able to predict the question or answer the questions by memory.
However, there are some things to keep in mind when using this setting.
Some multiple choice questions are authored "as listed". This means that if you select the "scramble assignment questions" policy setting, then it will also scramble the distractors.
Within the "attempts" settings, if you select the option, build on their previous work, the questions will not be scrambled with each attempt.
It’s best to select start fresh if you want to scramble the questions with each attempt.