The surveys I give at the end of year use focused questions to determine the (perception of) effectiveness of specific teaching strategies used. I make sure the question refer to specific strategies and are rated on how well they helped the student learn. Offer a space for suggestions regarding that specific strategy. I suggest avoiding questions which refer to "likes" or their "feelings". Roger (from the other board) had some very good surveys he used. I do not know if he frequents there anymore.