Question Bank Query

I would like to seek all of your advices regarding the Question Bank in Storyline 360.

1) We would want to 20% of questions (2 out of 10 questions) to appear when the test is repeated, irregardless of whether they got the questions answered correct or wrong.
 

For example:

1st test – 10 questions

2nd test -  2 questions from first test appear

3rd test – 2 questions from second test appear  

 

2) Then similar to 1st item above, for 2nd test, what if 2 random questions came from 1st test? 

 

Any approaches in Storyline 360 would be a great help. Thanks in advance.