The plugin is great. However, there I found an issue when the Sorting Choice is being corrected. As soon as one of the choices are in the correct place the question is marked as correct (in the progress tabs at the top).
Also, when reviewing the answers it would be more user-friendly to have their answers (and whether they were right (green border) or wrong (red border) ) displayed and not the solutions. They would be able to compare their answers to the solution (displayed underneath).
Overall, a great plugin. Thanks