I'm glad they banned mechanical pencils. I took quite a few timed PrepTests at the public library; I kept my focus through little kids screaming in the youth zone, older kids skateboarding right outside the window, and the intermittant chatter at the reference desk. Then came the girl with the click-pen. She sat at the table directly in front of me, and it started within 60 seconds of her arrival:
***click-CLICK***
***click-CLICK*** ***click-CLICK***
***click-CLICK***
***click-CLICK*** ***click-CLICK*** ***click-CLICK*** ***click-CLICK***
*click*
My heart rate increased rapidly; I felt my blood pressure soar. I panicked as I imagined taking the LSAT while being pummeled by a sporadic set of percussive sound waves bent on preventing me from reading anything longer than six words. It was the only distraction able to break my concentration during my training; I wanted to beat the crap out of that girl and blow up her click-pen. I had to remind myself that no-one will have mechanical pens/pencils at the test, and I nearly fainted in relief as I got up to vomit in the restroom.
Good Luck on the LSAT; remember it's no harder than any Practice Test you've already taken!!!