MDL-40992 quiz: option to let students redo questions within an attempt
This feature is designed for use on pracice or formative quizzes. It is available for quizzes that use Interactive or Immediate feedback behaviour. If the teacher turns this on in the quiz settings, then once a student has finished a question, they get a 'Redo question' button beside the question. If they click it, then the question they finished is replaced by a new one so they can try again to practise that particul skill or bit of knowledge a bit more. When randomisation is involved, the studnets will be given a question or variant that they have not seen before if possible.