As a professor, I encourage a student with documented disabilities (learning, physical, or psychological) to register from Day 0 with the disability services office in college and have the appropriate accommodations in place from Day 1 of the semester, even if you think you won’t need them or use them. It’s always better to be prepared. Professors are not legally allowed to give retroactive accommodations that cover the part of the semester prior to the student’s self-disclosure through the disability services office.