If you want to give students the option to answer an x number of questions out of y number of choices, here are two ways you can do that.
Either option has its benefits:
With the new quiz option, you can
- Deploy Lockdown Browser so that the exams cannot be shared
- Check exam log (when they started, how long they spent, etc.)
With the assignment option, you can
- Use the Speedgrader to comment on their answers
- Use rubrics
- Use peer reviews if there are scenarios in which you want people to grade one another
Let us know if you want to discuss the options further.