Exam - questions randomization

Hi community, I am trying to develop an Exam which at the start I thought it was an easy product but its becoming very very tricky.   Here is the scope:

I have 2 sets of questions.  One set are situational questions and the other set are fact questions.    Each set includes 20 questions and I need SL to only show/randomize 10. This means I need to have a 20 questions exam (out of a 40 questions bank).

The tricky part here is that the client needs the Exam to always show 1 situational. 1 fact etc..

This where the whole logic problem started.

After trying different question bank combinations I ended up with the idea of have 20 question banks with 2 questions each and SL to randomize 1.

Here is the screenshot: you can see I have 1 Question bank that hosts all "Situational" questions, I´ve only included in the shuffle 2 and ask SL to include 1.

My scene setup looks like this: where you can see I have 1 Question back slide to show 1 Situational, next one will show 1 fact etc..

So far I thought this was the solution but I am finding out that when I select the "Retry exam" button that includes the following,  the randomisation doesn´t.  No matter how many times I retry,  SL always shows the same sequence of questions.

I would appreciate any help, support, advise on this type of examan and randomisation setup.

Thanks!