FA wont drive your score upwards. If anything you might hit 229 since FA is what most other MD students use for the exam. If you do what everybody else does, you get what everybody else gets...an average score. So drop FA.
You should have been using Uworld since 2nd year started. Assume you did purchase it then, about a year ago, here is what you should have been doing.
Your first pass of all of Uworld, regardless if approached by section or subsection, is about learning. If I recall correctly UWorld even states as such on either their FAQ webpage or their home screen on their app. Dont take UWorld on first pass to diagnose yourself. The questions can be very difficult and many questions are nitty gritty detail you probably didnt study during your courses. Dont sweat your scores for your first pass of the ~ 2500 questions. For those questions you get incorrectly, either mark them or retake that same exact exam for only the incorrect questions. This is where the hard work begins. For each missed question for each exam, either marked or by reviewing the missed questions only, take hand written notes on the concepts you missed as well as notes on why the other answer choices were offered. THIS IS WHERE YOU DRIVE UP YOUR SCORE.
After doing all of UWorld, you should possess a very high stack of pages of notes on missed concepts. Review all of your notes in detail. For those concepts that require memorization (bacteria, viruses, biochemistry, pharmaco, immunology CDs, ILs, cytokines, etc) rewrite those concepts over and over again by hand under you can draw them on paper without looking at the textbooks. It took me a lot of time to write by memory the different unique characteristics of the bugs (e.g. PYR, bile, oxidase, catalase, hemolysis, ds DNA, ss RNA, hyphae, etc). Write them over and over and over again. Repetition is a potent teacher.
Take a second pass of all of ~2500 Uworld questions either by subject or subsection, 40 questions at a time. Do exams under tutor timed conditions. Your scores should be higher. After each exam, review missed questions and create new handwritten notes. Do all of UWorld this way and by the end of your second pass you should feel more confident about the material and about yourself.
By now you way ahead of the other MD students since no one does this except those who score 250+
Reset UWorld since you have had it for 1 year by now.
Buy the 2 diagnostic UWorld exams 30 days prior to your actual exam. At day 30 out from your actual exam, do the first diagnostic under authentic timed conditions like an actual 8 hour exam with breaks. Check your score. Evaluate your strengths and weaknesses.
Go back to your reset Uworld qbank. Do all of ~ 2500 questions of UWorld a third pass under tutor timed or timed conditions. I started under timed but switched to tutor tijed to see my errors immediately. Mark the ones you missed. You should be doing UWorld 12 hours a day, 30 days straight, the month prior to your exam. You should be flying through them with having ample time for each exam. Review your missed questions. Your third pass exam scores should be much higher than your first pass and second pass.
Do your second diagnostic exam. That score should be higher than your first diagnostic exam. Do NBME if you'd like. I did three and found them worthless other than making NBME money.
Now you are ready to take your Step 1 exam.
My scores: first pass: 30s/40s, second pass 60s/70s, third pass 80s/90s
Vaya con Dios!