CR: GMAT Prep vs. Veritas Questions bank

Hi folks,

I used the questions bank of the Gmat Prep, including the set they sell on line, and my results in Critical Reasoning were great. Almost perfect and on time!, including the hard questions.

Now, I am using the questions bank of Veritas, but I find the CR questions more difficult than those in the GMATPrep (notice the parallelism ).
Is just me?, or are they more difficult really?, With these new questions, I am not as effective as with the gmat prep questions. :s

What should I do? Practice more Veritas questions? Really, I am almost ready to take the test, and I don't want to spend more time studying. I want to focus on my essays.

Thanks!