Hi aishhole,
From what you describe, you likely have the knowledge to score higher, but the types of little mistakes that you have noticed in your work are a direct result of how you take notes and organize your work on your pad. Over the last 4 months, you have likely developed a 'default way' of working through GMAT questions - so it's unlikely that you will be able to make any significant changes to how you do that work in just a couple of days.
While you might be tempted to do a lot of studying in these last few days before your Official Exam, "cramming" rarely leads to great results with Tests such as the GMAT - so you should limit your studies to general practice and light review (NO CATs and NO lengthy study sessions) - you would be better served by getting some extra rest so that you can go into Test Day calm, clear-headed and ready to work.
GMAT assassins aren't born, they're made,
Rich