A significant part of taking ACT or SAT is that a student has to learn to focus for the whole length of the test and maintain a level of excellence across all sections. With this change it eliminates that critical aspect of the test and one can just prepare for one section and try to ace that. A natural extension of this would be why shouldn’t college board also allow AP tests and SAT subject tests to be taken at subsection levels. How is that equivalent to preparing for the whole year and taking AP Chem in one shot.