1. Screen Magnification Basics
Everyone wants efficient random access to info
Someone without vision loss can quickly scan a screen for what's of interest  
The order and attributes of the text allows zeroing in and skimming important content
Magnification users can only see part of the screen at a time
2X mag only shows ¼ of the screen
4X mag only shows 1/16th of the screen
As magnification level increases
Ability to orient yourself decreases
Finding relevant data becomes harder
Screen Magnifiers have features to help compensate

2. Screen Reader Basics
Screen Reader users get a sentence at a time via Braille or speech
Like consuming information through a straw
Reading a screen from top to bottom is very inefficient
Screen Readers differ in the number of keyboard shortcuts that:
Allow you to navigate to things of interest
Aggregate info and present it together
JAWS has many more blindness productivity shortcuts than you'll find on a phone or tablet

3. Why Standards Are Important
They allow JAWS efficiency tools to work consistently across web sites and browsers
Efficiency tools for test taking are superset of those for reading web pages
Additional standardization will allow functionality targeted at specific question types
Especially important for more complex questions

4. Which Tools Should Students Use?
Each Screen Reader and Magnifier has its own personality
Students should be allowed to use the tool for test taking that they use for other tasks
Need to be encouraged to use and to become experts with those that offer best chance of success