Tell me the characteristics of these materials:

DELTA: DELTA has two books, red and blue. Most of the blue delta is classified training. Finally, there are four sets of simulation questions. The red triangle is a pure simulation problem with 6 sets of * * *. The simulation problem of red and blue triangle is a level one difficulty. Can be used as a preliminary question to find feelings. But some questions are not very good, especially oral English and writing, which are a little different from the real questions. Reading and listening are not bad. Personally, the comprehensive difficulty of DELTA is about 70% of the real problem.

Longman comprehensive course, that is, the great green book of 9 CDs. It is divided into very fine points, classified training of various types of questions, and a model test CD. The characteristics of this book are: it is extremely suitable for introductory training, the classification is very clear, and the reading and listening materials are also very close to the real questions. But the fatal disadvantage is that it is too simple. Only suitable for the most elementary entry. For example, students who have just passed CET-4 can take an examination of Longman 1 week to find their feelings. Personally, I think Longman's difficulty is 50% of the real problem.

The most valuable part of Balaam Balaam is listening to jokes. The pure listening part of Balang's listening is more difficult than the real question, especially the length, which is definitely longer than the real question. The theme, logic and style are very close to the real question. But the questions are too simple, and some questions don't need to be understood at all. They can be selected through logical relations or even common sense. Therefore, the most valuable part of Balang's listening is the pure listening part, which is regarded as intensive training of listening skills by countless people. I think the mid-term intensive training must be practiced with Balang. Balang's reading is ok, but it is more difficult than Bedelta, but it is still different from the real question. I can't say anything different. Perhaps this is the uniqueness of the ETS real question. But overall, Balang is still very good. If I suggest, Balang only does listening, which is used for mid-term reinforcement. The difficulty of Balang's listening passage is 120% of the real difficulty.

TPO: It is absolutely strongly recommended that in the middle and late stages, especially those who want to take the 100+ exam, they must study TPO seriously. It can be considered that TPO is the real problem. Now TPO is 23 years old. If we can thoroughly study these 23 sets of real questions, the consequences will be absolutely unimaginable. It may be a bit exaggerated, but it really works. Especially familiar with the genre, discussion mode, topic point, logical characteristics and so on. If you can integrate with TPO in the later stage, you will have a very familiar feeling when you take the real exam. I just had such an experience, and there were only 13 sets at that time, and I only studied 10 sets in depth. I found that the real question was exactly the same as TPO during the exam, so I changed the medicine. The average difficulty of the existing TPO is 90% of the current real problem, but the similarity is 100%.

If you are efficient, you have finished all the problems. You can try high score 120. This information includes books and model testing software, which can be downloaded. Generally speaking, the difficulty is the biggest of all materials. But the questions are not good, reading and listening, too many details, countless details, too much neglect of logic and the whole. But it can also be used as a holding state.

Vocabulary book: Li Xiaolai's "Get TOEFL Vocabulary 2 1 day" is highly recommended. If this book is relatively stable, you can choose Zhang Hongyan's Word Segmentation by Category. If you still want to take the GRE, you can recite the core vocabulary of GRE directly after "2 1 day" is finished. In fact, you can master 2 1 day completely, and you can read 24+.

To sum up: choose materials according to your actual level and feeling. Generally speaking, the first entry is to find feelings: Longman, pre-warm-up: Delta, mid-strengthening: listening to Balang, reading TPO, speaking TPO, writing 185 question bank of TPO and OG, or Li Xiaolai's 185 analysis. Late sprint: take the TPO mock exam in the real exam time, study TPO repeatedly, and get a high score of 120 when you have time (if the TPO research is not good, it is best not to get a high score of 120).

It should be planned for three months. I wish you success!