Ran16, first of all, yes, it is definitely possible to get BEC, REG, and AUD completed by March 4th. You just have to want it really bad! As others have said, I would suggest taking REG next. REG is the one that will be most impacted by the changes. Plus, REG has more material than AUD (even though AUD is a longer exam, which has always confused me).
I’d say you probably need more study time for REG than AUD. I’d recommend maybe about 7 weeks for REG and 5 weeks for AUD (I knocked out REG and AUD in about 4 weeks, although I definitely could have used another week or two for REG. For AUD, I felt ready).
I’m not sure how quickly your testing centers fill up, but maybe you could delay scheduling REG until you spend a couple weeks studying for it so you can get a gauge of how you’re moving along? Then, you could decide how much time you need to study for it in order to have a good shot at passing. You may feel confident with REG and feel you can get it done in 6 weeks, which would leave you 6 more weeks for either restudying BEC or studying AUD. However, you may find you’re struggling and need an extra week or two for REG.
Once you take REG, you should have your BEC score back, so you can determine whether you should retake it. Personally, if you find out you failed BEC, I’d probably reschedule BEC and take another shot at it before the exam changes (Yes, I failed FAR and waited until I had passed all the other sections before retaking, but my situation was different).
One last note, you say that you can probably get about 3.5 hours of studying every day. Does this include the weekends? I think 3.5 hours Monday-Friday is adequate (that’s probably close to what I averaged on the weekdays), but on the weekends, I’d suggest aiming for at least 6-7 hours on Saturday and Sunday. Ideally, you should aim for at least 30 hours of study time each week. I know this is difficult when working full time, but how bad do you want it?!
Good luck!
AUD - 85 (8/30/2015)
FAR - 73 (10/13/2015), 85 (2/29/2016) (AND DONE!)
BEC - 83 (11/04/2015)
REG - 81 (11/30/2015)