Here's my advice based on what you've explained above. I'm assuming you haven't passed any section yet right?
Based on my experiences and MY OPINION so far:
1. FAR is the hardest test because there's a lot of information to cover... and the test is also tricky etc.
2. REG is the second hardest test because of all the rules and combination of b-law and tax.
3. BEC is the hardest test to pass on the first try because there is little margin for error given the nature of the exam (only 90MC of which 70 or so count versus everyone else).
4. AUD is the easiest to pass given the nature of the exam and the amount of time given to take the exam (5 Hours).
SO, here's what I think given that you're so hung up on your AUD score.
1. Block everything out, including your AUD score. You NEED to do this, You NEED to focus on #2.
2. Focus and study for FAR! You can do this. You've started, so don't stop, pretend this is your first test. Plan to take it by April 16th, it's a Friday.
3. You'll receive your AUD score in less than 2-weeks. If you pass, awesome! 1 down! If not, don't panic, focus on FAR!
4. If you passed AUD, take FAR, then spend April 19th - May 30th studying for REG. Take REG on May 31st (or some day at the end of the window that works for you. If you failed AUD, spend that time to re-take AUD at the end of the window.
5. Focus only on two tests next window... don't worry about the other 2 after these two. Then come up for a plan for the remaining (BEC and/or REG, if necessary)...
Hope that helps.
√ AUD - 87 (8/12/09)
√ REG - 77 (1/15/10
√ BEC - 77 (1/6/09 - Expired) / 79 (11/18/10)
√ FAR - 75 (2/11/11)