I think that you might not be able to access the old tests after the course was deleted(it says "Important: We recommend downloading, printing, or screenshotting any data from Khan Academy’s legacy Official SAT Practice that you wish to retain as this data will no longer be accessible after December 31, 2023." in their "Moving from Official SAT Practice to Official Digital SAT Prep on Khan Academy" article").  It also says that you can not take practice tests in khan academy now.