The items in each area of the assessment are a heading so you can go directly to the question by pressing the 'h' on the keyboard.
Use the 'a' to go to the answers.
The 'up' and 'down' arrows in the keypad can be used to read the answers to the item.
The '/' can be used to select the answer.
There are many ways to use the JAWS keystrokes to navigate. Do what works best for you.