I know someone who's undecided between law and graduate school. Personally, I think you should stick to whatever interests you more. Doing better on a test isn't necessarily a indicator of ability. If you're interested in the material then I guarantee that you'll do well regardless of your test scores.
I'm going to have to agree with most here. I scored 770 on the GMAT. I took a long hard look at that career path and came to the conclusion that I would rather spend eternity in the 7th circle of hell rather than the 9th. Law school it is.