Ask all the questions you can no matter how trivial they might seem. Most doctors will appreciate your questioning.
The foot scrape is for checking Babinski's sign. The sign is present in newborns but should not be present in older people (older than a newborn). When your doctor scrapes your foot, the big toe should not move up(curl upward). If your toe curls down, your reflex is normal, if it curls up, then there is something neurological happening.
Other reflex signs you may or may not be tested for include:
Chaddock's Sign: Similar to Babinsky's but testing for lesions in the corticospinal tract. Your neurologist will touch the skin at the outside of your ankle. Your foot response will be like Babinski's sign (big toe up means a problem....)
Hoffman's sign: This is also similar to Babinski's but involves your hands rather than your feet. The test involves tapping the nail on the third or forth finger.
Doll's Eye Sign: The neurologist is looking for dissociation between movement of the eyes and of the head. A positive response is when the eyes moves up and head moves down.
Sensory: This is done with tuning forks and pins and tests the level of sensory perception in certain parts of your body.
I have had the sensory, once with tuning forks and the rest of the time with pins. My neurologist at the time said that he usually followed the Babinski test with a sensory test. The pin test was able to show my neurologist the extent of nerve problems in my hand.
I have also had the Chaddock's sign tested too. I prefer it to the foot scrape!
I hope this helps somewhat. As to reading your own results, I prefer to let the doctor explain each item so that I do not go off on a tangent.