it's a good idea to take practice tests somewhere with distractions. when you take the actual test, there will be little things that will get on your nerves if you're used to studying someplace as quiet as a library. air-conditioning, someone with the sniffles or a cough, someone who erases alot next to you, it sounds kind of silly but when you're trying to finish the actual test under timed conditions, these things get to some people.