I don't have a learning disability, but I'm a pretty slow reader. I cheated on a section of the SAT by finishing another section with lighter reading and going back to the unfinished one.
I'm not familiar with the SAT, so I might be misunderstanding. But how is returning to an earlier section of the paper after you've completed a later section considered cheating?
In all the exams I took over high school/university we could complete the paper in any order we like.
The SAT is divided into sections, with a time limit for each one. If I recall correctly, each one is 10 - 30 minutes, with multiple sections making up reading, writing and math.
The test is also designed with time pressure in mind.