I have used most of the veritas prep Cat's by now and they have done good job with simulating the GMAT experience in terms of difficulty level and the questions level . Verbal I found to be a notch higher as SC's are bit lengthy and RC's as well . CR 's are as expected and in line with what we get in GMAT exam . I think one should definitely enroll for their GMAT prep mocks to gain more confidence in attempting exam . Order is important while selecting exam , I have tried both with Quant first and Verbal first to gauge my level .