Where are you at with the course and have you taken a diagnostic yet? If you're taking the March LSATs I would recommend to start taking at least 1 PT per week until then. From your display name is looks like you're trying to get into the JD program at Melbourne Uni and with their application process, the 3 times limit per year for the LSATs won't apply to you (since there are only 3 LSATs left until deadlines for applications).