It is usually necessary to read chapters in biology texts several times. There is too much information to absorb through one or even two readings. You will find that studying for many biology courses will be like taking a language course. There are many new words and it is necessary to learn the words and what they mean. The glossary in the text is excellent, so make use of it.
Some students find it helpful to make flashcards.
Attend lectures and take notes. Write down questions as you read the chapter assignments and rewrite your lecture notes. Make sure that your questions are answered during lecture, office hours, or in a study group. Go over the Checkpoints at the beginning and the Questions at the end of each chapter. Talk to the instructor regarding your questions either in class, during office hours or at some other pre-arranged time.