Comment on 12th OG diagnostic Test

Can someone please comment on their personal opinion of the 12th OG Diagnostic test compared to the practice CAT's on GMATprep, MGMAT, ect.

Only reason I ask is because I started going through the first part of Quant on the Diag. and felt like it was much more difficult than many of the actual "past" GMAT problems I encountered in the same book (problem sets given at end of each MGMAT guide)

If so, then I don't want to waste my time and frustrations and would rather attack the CAT's. I felt the diagnostic was purposefully tricky in it's wording as well as some of the problems were simply ridiculous. Finding the product of all prime numbers under 20 by hand was just draining; just over 9.6 million...sheesh

Thanks for the comments.

~Blake

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