Since you still need to retake the first 2, I think if you gave FAR studies a chance - just kick up the study time, then you may be okay. Just give up everything else and let everyone know ahead of time what is going on. Think you have up to 24 hour notice to give for a reschedule - but check first - I may be wrong.
I'm suggesting you stick to it because you will need to retake 2 exams and may want to get FAR out of the way to focus on the next 2 retakes. Give it a shot. Honestly, I believe FAR may have been beneficial to take as the 1st one to assist with AUD that you failed. I felt that way when I took it. REG would not relate much. Good job on passing BEC; however, I am challenged with that one and the IT.
AUD - Passed:)
FAR - Passed:)
REG - Retake TBD
BEC - Missed by 3 points Retake TBD