You can make quizzes with randomly chosen questions to minimise the risk of cheating to to give a larger variety within a practice quiz. The principle is fairly simple - add questions of an equal value into question groups, then specify how many from that group each student should see.

There are many ways to work with questions in question groups. The method you choose may vary depending on to which extent you would like to use random questions.

Adding questions directly into question groups - good for those who want a fairly limited number of random questions
Linking to a question bank - good for those who wish to use exactly the same random questions in several courses
Finding and copying questions from a question bank - good for those who would like to have a large bank of questions, and who like to use different questions in their different quizzes

Adding questions into question groups - good for those who want to use a fairly limited number of random questions

Adding questions to a question group

If you only need a few randomly chosen questions, it is easiest to add them directly into the question group in the quiz you are working on.

Click on the +New question group button
Type in the name of the question group, specify how many questions the students will be asked from the group, and how many points each question is worth.
Click Create group
Click on the plus symbol inside the question group to add a new question. The more questions you add, the more variation in the questions that the students will get. Remember to click on Update question for every new question before you click on the plus sign to create a new question.

To make a question bank

If you have lots of random questions, it's probably better to build a question bank, which gives you a better overview. You can make question banks in any course, but if you bookmark them and name them, you can use them across all of your courses. I've chosen to create a course which I call 'My question banks', in which I save all of mine, just so I can always keep track of where the original questions are.

Creating a new question bank

Click on Quiz in the course where you would like your question bank to be saved.
Click on the three dots to the right, and choose Manage question bank.
Click on +Add question bank
Type in the name of the question bank. Hit Enter on your keyboard to save the name.
Click on the question banks name to open it and add questions. Adding questions works exactly like it does in a normal quiz. The only difference if that the button which adds questions is up at the top right, instead of in the middle of the page. As always, it's important to click on Update question before you move on to adding the next question.
You can see that a question bank is bookmarked by looking for the little cross on the banderoll. If there is no cross, you can click on the banderoll to bookmark it.

Link to a question bank - good if you want to use the same questions in lots of quizzes.

To link to a question bank is the quickest way to make random questions from a question bank. One advantage is that if you want to add extra questions later on to the question bank, they will also get added to your quiz. One disadvantage is that you cannot see which questions are in the question group in the quiz. To do this, you have to go to the bank that you have linked to.

Note that whatever the point value that you have set for the questions, all of the questions, the score will be the number of points you have given for the question group.

Linking to a question bank

Click on +New question group
Type in the name of the group, and how many questions should be used each time, as well as the point value for the questions.
Click Link to a question bank, and select the question bank
Click on Create group
Done!

When this has been tested, there has been a problem that the linking didn't really work properly. This may just be bad luck, or it could be that since question groups are so quick to create, it's easy to make mistakes.

Find and copy questions from a question bank - good for those who want a large question bank, and different questions in different quizzes.

For more control, you can choose to use questions from a question bank. This way you get a copy of the question from your course instead of a link.

Copy questions from a question bank

Click on the Find question button
Select one of your bookmarked question banks, and specify the number of questions you would like to use
Choose New group in the dropdown menu
Write a name for the question group, write how many questions each student should get and how many points there are available for the questions. Click on Create group
Click on Add questions at the bottom of the window

It is possible to add questions from several question banks to the same question group if you use this method. In which case, you repeat steps 1 and 2, and then step 3 you can choose the question group you have already made.

Test your quiz several times

You should test your quiz several times to make sure that it works. You should get different questions. You can test directly using the Preview button as soon as your quiz is ready. If you choose to test in Student view, you can use the button to reset Student view, so that you can quickly have another try at the quiz.