That is all based on personal preference. Looking back I wish I would not have wasted any time with Rx or Kaplan. The only reason I think Rx is useful is if you are not someone who can just sit and memorize first aid. Honestly your best bet is UW and dissecting each question and all of the explanations which will take forever and reading first aid and making sure you understand first aid not just memorizing words. If i could go back and do it differently thats what I would do and it should take you all day if you are doing it correctly. Sorry if this looks weird/has mistakes. I am using a vietnamese keyboard and it doesnt have certain characters.