You could first have a variable of type list of questions where you would make a ListAppend to add to it only the questions that have already been used. Then you would make a condition (with foreach) where you would check if the questions for the next exam are in the previous list - if so, skip them, allowing only the ones that would not have been used. 

Hi @Diogo E Filipe ,

You can also use ListIndexOf to check if the question already exists on your local variable list. It will return -1 if there's no repeated question, and you could do this before appending to the local variable

Hi @Diogo E Filipe

The easiest and fastest way code-wise is just using the ListDistinct action on that variable, before starting the exame, passing your list as input, and it will return your list without repeated values!!!

Let me know if this helped!
Cheers,
Paulo

There is a similar question already posed, this is a good reply with resources to use:

https://www.outsystems.com/forums/discussion/50411/how-to-generate-random-string-and-integer-in-server-action/#Post187075