You can rearrange the questions immediately after creating an exam by clicking the Rearrange Questions button at the top, or at a later time. To rearrange the questions at a later time:
Click the module access icon > Academics > Examination > Online Exam > View Online Exams to open the View Online Exams page.
Select a batch.
Select the exam whose questions you want to rearrange.
In the top right, click the Rearrange Questions button.
Click and drag to change the order of questions.
For more information, view this: