Checking for Learning

So this year I am not going to do the pre- and post-tests. I know, cue to the shocked faces… I just feel like the results will be skewed. With all the overcrowded classes I have had, I can hardly say the lessons are at the maximum potential. My guess (and from the test I gave last week) I see that the scores will be uncharacteristically low due to the problem with the teaching environment. That said, I am happy to say that I am not too disappointed because I tested all the lessons last year quite thoroughly.
BUT WHAT ABOUT FEEDBACK?
Yes, what about feedback one may wonder.
I am doing a survey at the end of each lesson. I will ask four questions:
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1. Is the lesson two short, just right, or too long?
2. Was the lesson too easy, just right, or too hard?
3. What are the 3 easiest vocabulary words/phrases?
4. What are the 3 hardest vocabulary words/phrases?

 
That’s all I got so far. I feel like this structure can be improved. I will let this roll around in my head and hopefully, I can come up with something better. I may be able to find something online or I may just ask one of my language teachers for help too.