One practice LSAT is nothing, don't worry too much about a single low score. What I'd be more concerned about is that the LSAT is not too far off and you've only taken one practice exam. You need to take dozens of practice LSATs, and if possible a prep course. If a prep course is not possible, use get some good study guides (Powerscore, etc). Take the time to comprehensively review each practice exam and understand why you got a certain answer right or wrong. Apply that knowledge to each new practice exam. Starting now you need to buckle down and dedicate every possible minute to prepping.
To have a good shot at SW you probably need 155-160. My understanding is that the SCALE program is far more selective, however. If your cumulative GPA is 3.2 that means your community college GPA must have been around 2.0-2.2? You might have to write an addendum explaining the discrepancy in GPA, especially for the SCALE program. Do everything you can to raise that LSAT, it's going to be the determinative factor in your law school admissions.