If you want to retest any of your students on the same Blocks, you can make a completely new question paper without repeating any questions.* If you do not want the questions in a particular test to be reused in a new test, then just remember to mark that particular test as “Used for assessment”. All such “used” test papers will be visible to the other teachers in your school who teach the same subject/grades, so they can use them too.
If you have multiple sections in each grade, you could generate a unique test paper for each.
You can make up to 3 unique test papers on a given topic, with no repetition of questions.