1. on ebay, etc or paint them with Night Shades, or model car window tint from a hobby store and some clear coat.(looks very close to the same)
2. Depends on if they want to give you a hard time. With all of the new cars out now with factory tail lights that are either dark or clear, law enforcement can cause issues but don't usually
3. Shows thru fine. Do a search, there are pics on here somewhere
4. Get back in there and study, I expect nothing less than a perfect score out of you and remember you can always do better.

Good luck with the test and take it as many times as you can.