In fact, if your level is good, you can prepare for the exam yourself. What you need to do is to know the difference between this exam and previous exams, and get familiar with some of his processes, which can be found in official website. For example, you can't enter the venue after 8: 30, don't be late; Reading and writing are all one hour, so contact the time control; Never open a book or continue writing before or after the examiner says to open it. This will be considered cheating. Warning the first time, demoting the second time. All these suggest that you can visit official website.
If you prepare for the exam yourself, you can generally buy Cambridge Zhenti 1-7 as a reference book. You can also use the official "IELTS Road" after registration. I just logged into the registration website, and there is a special link under "My Status", which can be used for 7 days after the exam.
Training is also a way. In fact, to put it bluntly, this is caused by our previous learning methods. Everyone feels that they have no direction in reviewing, and they expect to be guided by teachers in training institutions. The teacher of the training institution actually tells you what this exam is and what process mode it will be, and then asks you to do the questions according to Cambridge 1-7. I think we can do all these by ourselves, but our personal habits are different. For psychological reasons, some people may just feel that their psychology is practical and understandable. But don't expect teachers from training institutions to help you out, which is actually unreliable. It is better to spend more time to really improve your English ability than to waste time on empty topics and make yourself nervous.
This is my personal experience. I prepared the exam of 7.5 myself for your reference.