Can the system auto-fill some fields?

How can I match the people who fill the form in pre and post tests. if there is no name
What can I do to fill the nickname part automatically in the system?
Or after a person makes a pre-test, does the automatic pre-test nickname come when the same person performs the post-test?

Is it that you have a list of participants participating in the pre-test and the same list of the same participants participating in the post-test? In this case, you could always have the select_one type that lists all the participants’ names.