One important aspect is satisfaction of the learners themselves. The happier a participant is with the learning unit, the more they can learn.
You can measure the participant’s satisfaction with the help of:
In your case, online surveys are the most suitable option, because you can create and complete those in WordPress :)
Alternatives to WordPress-surveys are free of charge online survey tools like LimeSurvey and SurveyMonkey. These are just the most common online tools for surveys and are not a recommendation of the authors!