CPDT

I'm trying to decide if I should take the CPDT in Nov or March. 
 
For all of you out there who've taken the exam are there any pointers?  The body of knowledge for the exam is quite extensive.  What parts did you find to have the most questions?  Besides for their recommended reference list do you have any resources you'd recommend or what would be the top 3 books you'd use to prepare (that have the most pertinent info and cover the most)?
 
Any tips and or thought on the CPDT are appreciated!
 
thanks in advanced,
mere