Hi,
Just to make things clear, you want someone to create assessments for you, or do you have the assessments already?
Assuming the latter, you started by saying total 20 questions, of which 6 are mandatory and 6 are random. This totals to twelve.
In the example you stated, You've mentioned 30 questions, containing 6 mandatory and the remaining 24 random questions.
I just need a little bit of clarity here. I'd be glad to build the course for you.
Best,
Josh