Make a comprehensive plan!
Those who fail to plan, plan to fail.
A comprehensive plan that is developed and agreed upon by your team leaders prior to build season is more valuable than any technical improvements your team can make between now and January 3rd. Guaranteed.
You can win a competition using a robot with no sensors that you finished 2 weeks early and got hours of driver practice with.
You can't win a competition with a robot that doesn't move because you wasted your build season fumbling around without a comprehensive plan.
1114 has a great build season schedule
in this pdf that 1678 bases their build season schedule on. I recommend you take this schedule, modify it to meet your team's resources/goals, and agree on it as a team.
If you do just one thing before January 3rd, please do this.
-Mike