Playtime: I am in Law school now, so it is possible that i may know more than many of the very wise and knowledgeable posters here.
1) To get into the elite t-14 schools you need to score at least high 160’s, preferably low 170’s. To get into a lesser ranked tier 1 school low to mid 160’s are usually fine.
2) It depends how you define getting through law school. Obviously, some people do better than others. But most of the yeshiva guys that I know in school are doing pretty well (average or above). I didn’t make a real study, but my impression is A) The students that are brilliant can do well by just cramming towards the end of the semester. B) the students that prepare and study hard throughout the semester to pretty well even if they aren’t super smart. C) those that aren’t really smart and don’t study hard throughout the semester and try to figure it all out at the end don’t do well.
3) There are several books that you can read that give you a taste of what law school is like so that you can decide if it is for you or not. I suggest “law school confidential”, “1L” by Scott Turow, and “law school insider”. (Law school insider seems to be out of print so you might have to find someone that already owns it to borrow from.)
Another book that might help a lot is “getting to maybe”. It’s a book that explains the unique testing style of law school exams, and teaches you how to write essay answers that the professors are looking for.