I will not help racists...
<---(I am Dr. SlowVibes)
now it turned out to be you are the racist, eh?
I did both tests, they are similar in dificulty I would say.
1) The A.DAT has orgo and Q.R., C.DAT has carving.
2) PAT is a little tougher on a computer screen (A.DAT), especially for the Ang. disc. section... But for the C.DAT you get it on paper, so, its a little easier.
3) Questions for the the R.C. on the A.DAT seemed to be in order of the given paragraphs, so I found it easier than the C.DAT where questions are scrambled. However, some people like to make marks on the paragraphs, which is not possible for the A.DAT. Personally I found the R.C. section of the A.DAT a little easier.
Overall, I scored exactly the same on both tests, Academic and Science, and I wrote them within two months of each other. Like I said before and I will say it again, they are both equal in dificulty, it all depends on how ready you are.
P.S. if you live in the GTA let me know, I have lots of soap bars left with the entire kit the you get from the CDA. I also have some extra carving problems which you cannot get from the CDA or anywhere else, I can include that with the kit. The CDA sell them for $90, PM me and I can give you a good deal.
Good luck.