I'm new to this community, I'm sorry if the question is not appropriated.
I'm looking for a package to create Exercise Sheets like probsoln, with exercises loaded from an outside .tex file, but that I can assign an integer (the difficulty) to each problem and choose the appropriate difficulty for the questions of my exercise sheet. Is there such a package? If not, is there a quick way to add this feature o probsln?
Ideally, I'd chose a distribution of difficulty for the test, e.g.: questions 1 to 5 chosen from those with difficulty < 200, from 6 to 10 with difficulty from 200 to 400 and so on.