First Aid and the Uworld Question Bank are the two best resources and then you build out from there based on your strengths and weaknesses...i.e. Goljan or Pathoma for pathology, flash cards for micro and pharm, etc. If you learn well by doing then consider getting more question banks such as USMLE Rx or Kaplan...take notes of everything you learn from the questions and review it until you have it down cold.
Overall if you know everything in FA and complete Uworld you will know enough to pass. Take NBME practice exams or Uworld Self Assessments to gauge approximately where you are score wise.