True.
Making yourself rephrase and rewrite ideas or subjects can help you remember important information that you may need to remember for an exam. This method is a part of a study technique called "Active learning" which is a process of learning material through various activities and questions.
When it comes to "predicting exams" taking notes of important information not only makes the information in your own words, but makes it personal to you rather than memorizing a sentence that is unfamiliar to you.
Overall, rephrasing information in your own words is a great study technique that can help you remember information long term and help you prepare for exams.