Each state has different rules on medical education. In the state or states you are planning to practice in - at least look at their rules before you split to the islands to get a MD degree. Also realize you may be in a serious disadvantage in classes in medical school. While it is true you maybe able to do medical school level work, you may struggle to get passing grades. Plus some states may require a 4 year degree. That will be on their website. You want to make sure any time you go to medical school you can pass the classes. There is a lot of biological and chemical information. So I would say get your degree from a school first then do the MCAT and apply to US medical schools first.
Your good indicators of how well you will do in medical school are your grades in orgainic chemistry, anatomy (yes they teach a biology course in comparitive anatomy at most universities). If you aced with a capital A organic and anatomy - then I would say you would have no problem with medical school - but if you did those grades are are just hot to trot to medical school then I would say wooow horsey and rethink what will really look good for residency and practice.
Now about USMLE board scores - some people try to correlate the Step 1 with MCAT - The step 1 is a knowledge based test. The MCAT is a one part knowledge, speed stressed test with basic science, writing and reading thrown in for good measure. The Step on the other hand is based on extensive medical knowledge which to do well in the scaled score 80-90 range mastery of major and minor medical knowledge in 8+ areas. Please Don't think this 80%-90% correlates with the score 80-90 given on the Step 1. IT does not!!!! A pasting score of 182 is about 60% of the 300 questions given. The average score is 212 means they scored a 70% on the test. A score of 230 if you are coming from a US school will get you in most residencies if you did that the first time, have really good LOR's. Most island school students need at least a 240 80% to get the same consideration (if they are lucky). For the few student who score over 250/99 well the medical world maybe their oyster if they can back it up with really good interpersonal skills, verbal skills and really good LOR's.
Please don't buy the USMLE determines where you go theory - there are many other factors considered inthe match process. No Chief resident or hospital admin want a medical grad in his program who does not have good verbal skills, has the personality of a lizard but scored high on the Step. It is after all just a test. It is not a measure of how you will fit into a team medical enviroment.

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In Grad school in Biology

Wha tkind of scores does this school look at?