Use chapter or section divisions in the work to give yourself a notion of the main divisions of the work, astate those ideas in sentence form. For example, in the book, Three in a Bed , the thesis is that parents should sleep with their infants, not put them in cribs. Most of what you will be asked to review by your instructors will be written in the specialized jargon used within the discipline. Your writing style will be lucid and pleasant to read. They are very different.
Summary is objective while evaluation is subjective.
In other words, in summary you wish the author's ideas to be stated clearly, whereas in evaluation you judge the author's work. Don't be too humble about evaluating. Of course the book you are reviewing is written by an expert and you are merely a novice. So don't be afraid to judge. When you do judge, however, make the basis of your evaluation clear.