I just completed Aristotle Sentence correction grail book. I must say it is an awesome book to get command over the basics of English language. I would like to know from experience holders that after completing the book, i found its SC questions very easy. So are they relatively easy compared to the GMAT real questions or are they at same level if not more?
I agree. SC Grail is a fantastic book. However, the 100 practice questions at the end are of average difficulty level only. I guess they have been provided to help you with the application of the concepts you have learnt in the book. I found their New SC Questionbank which they released a couple of days back more challenging. It has a lot of questions which test you on meaning, so you should try those to get an idea about how you may be tested in higher difficulty level sc questions on the GMAT.