i think for bio you should use whatever textbook you used in college for your gen bio class. I have the campbell 7th ed txtbook and its a great soure. you can look up any info in a textbook. The destroyer is also great for bio. The solutions explain the wrong and right answers and at the same time gives a review which i find to be really helpful. it covers all the important topics you need to know, so if you know and understand all the solutions i'd think your pretty solid 😳 😀