Below you’ll find a generic evaluation survey that you may be able to adapt for your own purposes.
There are two pages. One has questions based around a 5-point rating scale. It looks like this:
The other has open questions like we discussed earlier and looks like this:
You can adapt or modify one or both pages depending on what you need for your context.
Remember: for obvious reasons, if it’s your class you probably need to get a different trainer, tutor, staff member, or another independent person to carry out this kind of evaluation for you. And don’t forget to adapt the questions to the level of your learners.