Not without a prep course and some meaningful way to gauge your progress. This is about what I put in, and I can tell you that it's not enough if you want to clear the 160 mark, which is what I hoped to do. Look, the benefits of taking a test prep course far outway the costs. If you have the time and the ability, taking an LSAT prep course and getting the nuts and bolts of the test down pat will probably improve your scores considerably. The cost is 3000 dollars (last time looked), and you will reap the benefits in terms of better tuition and better options. If i had it to do over again, I would take Kaplan or something comparable.
That said, sounds like you don't have time to change your mind on that one so make sure you are timing your answers. You need to be able to do all the questions in the allotted time, and in my first section I ran out with three questions to go. It set me up for what I can only describe as an awful testing experience for the remainder. So time yourself, or have someone time you. and take 2 practice tests under timed conditions per day.