Let's be serious here. You are recommending someone with 20 days left to invest hundreds of dollars in 2 new programs? Not only is this bad advice financially, but also bad study advice. The LAST thing you want to do with 20 days left is to carry a burden of completing 2 new programs with such limited time. You have been doing UW, so please learn and master it thoroughly and understand the mechanism behind everything! I still don't understand why you haven't invested in a copy of FA -- I mean, its the bible for this exam and a proven resource. Maybe try borrowing a copy and try getting through it 2-3 times. If you really feel like you won't be able to score what you like close to the exam, better postpone it if you can and study more. It is better to get a passing/better score with a bit more time, than just blitzing and failing/getting stuck with a bad score which would handicap your ability to get into a decent program. There is no magic patch to fix a bad medical foundation, but you can still make up for a bit of it with some hardcore studying/cramming given the amount of time. Wish you all the best.
PS: Don't take this the wrong way, but you need to improve on your grammar/spelling/communication skills if you plan on working in the States. I am a foreign student and it is easy to see that this is one of the main problems that IMGs face, so try and distinguish yourself by improving your language skills. It will help you tremendously in your career.