As a matter of fact, Kaplan with 4 full tests is the harder
The L and R in Barron is quite similar to the real test ( a bit harder)
Longman is the easiest for the beginner ( i think so, the S and W in Longman is rather different the real test)
Delta books are really a course in English for the TOEFL exam, so you are not just learning to take the TOEFL, you are learning more advance English as well.
The best book for learning to take the TOEFL test is the ETS book, since it is, of course, created by the firm that creates the test.
Kaplan, historically, has many errors, and doesn't provide the most effective way of teaching either how to get the best score on the test or the best way to improve your English.
I haven't used Longman, but have heard good things about the books.
I used Barrons 12th edition and did great on listening, speaking and writing.
I really recommend this book to anyone studying for it. good luck!
PS. I still have the book and am selling it for very cheap Let me know if someone wants to buy it for extra practice
Going through all of the above named books I should say that DELTA is the most difficult one.
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Delta IS a difficult book, but only for the speaking and writing sections. That is because many of their integrated tasks do NOT match the actual TOEFL (which is why I don't often recommend it to students). For example, on speaking task #5, they often include 3 possible solutions (rather than two) and on task #6, there are often 3 or 4 parts (rather than two). On the other hand, I found the multiple-choice sections (reading/listening) of the Delta to be far easier than the actual exam or other books. Many of my students who would typically get about 70 - 80% correct would get 95-100% right on a Delta reading or listening section.
"The Complete Guide to the the TOEFL -- iBT Edition," by Bruce Rogers, is the book I most recommend to students. It is the most comprehensive at more than 800 pages and 13 CDs of audio material, but beyond that I also like the way they break down the individual skills as well as the amount of practice material.
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