Start by creating a new assignment. (If you want to edit the order of problems in an assignment you’ve already created, click the three dots to the right of the assignment and select Edit.)
After choosing which problems to include in the assignment, you can change their order by clicking the pencil icon in the lower-left corner.
Here, you can choose to organize the problems by sub-topic, difficulty level, random, or manually, meaning you set the order yourself. To manually reorder problems, just drag and drop them into the order you want.
When you're finished, click Save to save the new problem order.