You can count on test questions from each reading assignment given. You should read the material carefully trying to understanding the basic concepts and terms. I will not test on trivia from the readings, but learning to decide what is important and what is not is a skill that takes effort to develop. Do the assigned reading prior to coming to class. You will get a lot more out of lecture by being familiar with the material.
Many people find it valuable to take brief notes while they are reading.
These can prove particularly helpful when studying for a test. Also, use your test as a reference. Use the index to help you find additional information on material you do not understand or need to clarify. You should begin studying for an exam several days prior to the exam itself. One night of preparation is simply not going to be enough for a course with a substantial amount of concepts and details.