A decade ago, colleges accepted test information and 504 plans from high schools to arrange college accommodations. Now, they require that test scores be only 2-3 years old. If your high school student has not been tested in the last two years, you need to 1) check with colleges of interest on their time limit for test scores and 2) get your teen tested again if it has been too long.
It is hard to predict how much support an entering freshman will need in college. Without valid test scores and a copy of the plan that was in place during high school, students may not be able to get extended time on tests and other accommodations in college.
Some students don't want to have a learning issue identified at college. They often reason that they may not need any assistance. However, if they do, an updated test and a copy of the 504 in place at college can make the difference between graduating and dropping out.