Here is an assessment for Algebra 1 unit 4, units, of Khan Academy (updated as of 7/01/18). There are three versions (I would recommend using version 1 and 2 in class and version 3 as a retake test). There is one extra 'fix it' version in case I have made errors, from which one can cut and paste questions into the other 3 versions. Please email me if I have made errors. The assessments have answer keys. There are both multiple choice and short answer questions. All of these assessments were coded/written in Examview to be highly variable (thus it is easy to generate mistakes and not knot). If a school or school district is interested in purchasing the Examview test banks from which they could produce a limitless number of highly variable tests/worksheets they may contact me directly at email@example.com.