Hey kayano,
Thanks for the question and welcome to the Forum! It's always tough to predict with certainty just how much someone will improve, so let me put it in terms that I'm more comfortable with and that should still give you a great deal of confidence: it is ENTIRELY realistic to gain another 10-12 points on your most recent score, especially if you dedicate yourself to a comprehensive course of study!
First, you've already shown that you have the potential for a score in the high 150s, since that's where your practice tests were, so there's no reason to think you can't perform at that level or higher on the real thing. The key is consistency!
Second, our courses see an average increase of around 12 points, and are so thorough and meticulous in how they prepare you that your practice tests scores pre-LSAT are extremely likely to be repeated, if not improved on, come test day. You'll spend months training to do just that! So now it's simply a matter of establishing your fundamentals, honing your skills, and immersing yourself in enough real test content attacked with the best possible methodology to push you to your full potential.
So I think you're absolutely on the right track and I'm particularly happy to hear you're eyeing our Live Online courses—they're amazing when you consider all that you get (two instructors, recordings of every lesson for continued review, every real LSAT question in existence, a homework hotline you can call 5 days a week for live assistance, and a ton more)—now you just need to commit yourself fully to the journey and keep working towards your goals! You'll be there before you know it
Jon Denning
PowerScore Test Preparation
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https://twitter.com/jonmdenning
My LSAT Articles:
http://blog.powerscore.com/lsat/author/jon-denning