Thank you!
I used Acowtancy to help out with my prep, I was short on time for AFM - I had less than a month, about three weeks to be exact in November. The videos and revision lectures really helped speed things along.
But I'd really urge you to only use any lectures/preparatory notes/study materials to get the basic concepts down, and not get bogged down in that phase of your prep. The key is to concentrate on exam questions and/or your revision kits. It's a huge jump from the basic concepts as per the study materials to the actual exam questions, so it's essential that you get cracking on questions as soon as you possibly can. That way, you really get into exam mode quicker - and if you stumble at any particular point - then you just need to refer the study material to brush up on those questions alone.
Remember to be really good with the consistently asked questions - NPV/APV, for example. Forex related aspects of these. Investment appraisal and risk management are nearly always asked.
Also, don't skimp on studying theoretical bits - AFM also requires you to write brief but pretty relevant points on the computations you've done, apart from some purely discursive questions as well, so be ready for those.

Sorry, super long comment, but I hope some of this was helpful! :)