The higher your grades and LSAT scores, the more options you will have in terms of top schools (unless you are an oppressed minority then you just have to read without moving your lips.)
Get all A's and you can't go wrong (and not that hard to do if you apply yourself, stay focused, work your profs and avoid hanging out with idiots. ) I did not apply myself at all and still got well above a 3.0 in undergrad. College is super easy if you are a reasonably good student or better. The exception is if you are majoring in something that doesn't match your abilities. (Such as a severely math challenged person majoring in hard sciences, engineering, computer science, etc.)
Many lawyers have liberal arts undergrad degrees; History, English, Poli Sci, Philosophy, etc. For criminal law, you could just as well major in drama, communication or criminal justice because, if you ever end up in front of a jury, making a great presentation is key.
Try to get some public speaking experience.
You can major in anything and go to law school. And it is not hard to get into a law school; it is hard to get into an elite law school.
Your school should have some sort of pre-law program. That can serve as a guideline. Or, if it has a law school, you could inquire there.
Check out the admissions requirements of the schools that you think you might be interested in. That will give you a clue as to what you will need in terms of GPA and LSAT. Lots of info on the internet. Google is your friend.
If you insist on going the liberal arts major route, I would suggest picking a subject that you really enjoy as your major. The degree itself won't be worth much unless you are attending a top school. Plan on having a very hard time finding a good job because liberal arts degrees, in general, grant you no marketable skills unless you go to grad school for an MBA, a JD or something similar. If you can't find a job, you can always pitch a tent on Wall Street with the other liberal arts majors.
I would suggest you change your major to something marketable unless you are 100% certain you want to go to grad school. Otherwise, you are probably spending a whole lot of money for no return.