One reason that math might have become more of a problem for you as you moved into higher levels of mathematics is that the concepts you were learning about became more abstract.
First, there are many situations where a student may qualify for either an IEP or a Section 504 plan. The decision as to which should be used should be made on an individualized basis.
That can make a big difference, especially with older students. One thing we run into is we often give students way too much technology at first, and that can become overwhelming for them.
If your child requires an accommodation of no penalty for late work due to his disability, this must be provided regardless of which parent he is living with.
You need to sit down with an educational consultant to discuss his current level of abilities and disabilities and to think through what your options are.
Your question relates to whether a school district can require the authorization of a physician in order to qualify for use of Books on Tape through Recordings for the Blind and Dyslexic.