I'm a high school math teacher. I enjoy trying new methods but I'm very much a numbers person and would like actionable data to determine the success of new lessons compared to old ones. Are there any RELIABLE and VALID pre/post assessments that I can give my students that are recognized as that. I know reliable and valid are the key things that are looked at in education pedagogy and I would like the data I collect to be as legitimate to outside peers as possible. To add some reason to this question is that I sometimes like to try unconventional methods or methods that are outside the norm for my particular school. I believe I make good assessments myself, but often times when talking to other professionals, those results are disregarded for various reasons such as test bias (I am writing the tests to test something I like) or credibility on my own ability to write reliable and valid tests and such. Specifically I would like to find a resource that allows me to get reliable and valid pre and post assessments for all high school math classes that I can give for example at the beginning and end of every semester or quarter. Thanks!