Personally, I think New Oriental's vocabulary book is good, and Spark's is also very good. I used Spark and New Oriental in college. My teachers and classmates all use these materials, which is very good and applicable. Spark's real questions and exam-related materials meet the requirements of teachers and students, and New Oriental's vocabulary memory books are very helpful to everyone. Personal point of view, when looking at buying information books, remember to suit yourself For reference only!