To be honest - I really think you need to invest more than just an hour a day to make that kind of jump in score, but that is just an opinion.
I am definitely a big fan of the Powerscore Bible books to learn the theories (and just as a tip read the formal logic and number/percentages chapters early). However, it is going to come down to practice tests, and not just reviewing the wrong answers, but reviewing the correct ones as well (especially those that you weren't completely sure on, but took an educated guess). I circle the question number to those that I found challenging, and I put square with a fatty underline of those that I thought were a complete mind-f**k, so I know to review, correct answer or not. Also, while it is great to take any test, my tutor is having me focus on tests 46-now, since those are most similar to the current test. I broke apart tests 46-52 to use as drills, and the rest are to be used under the full time constraints. Another piece of advice, when you review your answers, do it the following day, so you had a chance to step away from the questions and look at them with a fresh pair of eyes.
It's really going to come down to practice, practice, practice. You are actually at an advantage in some ways because you have taken the test before and know what to expect the day of the test.
And just so you know, many law schools do take your higher score (most of the ones that I saw need an explanation though). Even if you do average your score out you are still at a much better place than with a 143. If you are still in school, raise your GPA as high as you can (see if there is a way to get an A+, some schools have this even though it may state A is the highest grade - it's a secret no one tells you about. Possibly talk to a previous professor who knows you and tell them you are applying to law school, and see if any of your grades can be changed - even if it's a C+ to a B- that is still an improvement. They may not, but it never hurts to ask). Lastly, law schools are definitely more interested in your LSAT score than your GPA, so investing the time to do better is really to your advantage.