I think the type of accommodations depend on the college. Some are more lenient than others. Standard accommodations often include extended time, separate testing area for exams, and assistance with note taking.

I'm a senior in high school and planning to register with the disability service office at my college in the Fall. From what I've read, pretty much every college wants you to advocate for what specific accommodations you feel are necessary and provide evidence that you need the accommodation and/or have used it in the past.