How do you randomise tasks or questions for different exam versions (pool)?
Save the tasks that are to form random alternatives together in a directory in the question collection (see course settings: "Question collection" / "Categories" or "Questions"). If the students are to receive one of three alternative tasks for task 1, save these three tasks in the directory "Task 1", for example. If the same procedure is to be followed for Task 2, save the three alternatives for Task 2 e.g. in a directory "Task 2".
Now click on the test that is to contain the random questions. Click on the cog, then on Edit test content --> Add --> Add random question.
Now select the directory from which the questions are to be drawn at random (in the example "Task 1"). Proceed in the same way for Task 2 and all other tasks that are to contain random questions.