My teachers are trying to develop an exam that has a similar format to the PSSA where kids have to select 'all correct choices' which means, some question may have up to 2 correct choices (and if there are 3 correct choices, then "all of the above" will be added in as the fourth choice).
Has anyone attempted this?
In the multiple choice question, there is an option for Single or Multiple correct answers. Select Multiple. Then set your grading appropriately for each response. I normally divide 100 by however many correct answers and then assign negative amount to the incorrect answers.
There is also another question type out there called All or Nothing Multiple choice (or something like that!) that will only score the question correct if they correctly choose all of the correct options.