Most of what you’ll find involves integrating forms with IS but specifically skills testing might take something like a Wordpress plugin that can hopefully be integrated with IS. So Jotforms could be used but it’s not specifically a “skills testing” platform…rather a forms platform.
It is not really skills testing. It is just a testing software where we can define questions e.g. “Is this red or blue?” We define red as correct and report is generated after the test and we can see (and tag) every answer plus which ones the answered correct or incorrect. If you come across any then I would love to hear about it.
Christian, not sure if this is what you want, but bucket.io creates quizzes etc and integrates with IS. You can easily apply a tag to every answer. Might be worth looking into.