There are different stages that the exam will cover, so when you take it, you should know exactly what is on it. You need to be able to answer all the questions correctly, or you will have problems on your future exams.
If you take the exam by yourself, you will only be studying a single individual test at a time. This is just too much, and you will forget important information and come up with common mistakes.
When you use an instructor to teach you, you will be given multiple tests, so you can study multiple topics at once. This way, you will be able to review the material and catch mistakes, and they will be marked accordingly.
If you were to do the exam by yourself, you will only be using the information you got from the book to help you. You will be able to get through it faster, but if you do not understand something, you will still have trouble in your exam.
One thing that you will notice when you do an organic chemistry practice exam is that you will want to use what you know. You will not be able to review everything that you have learned during the semester, so if you do not have a topic at hand, you will need to use something that you know.
Sometimes you will have to do this, because if you did not use it before, you may not have any idea what it is. Other times, you will find yourself having to use a different resource.
By using the ACS guidebook, you will be able to study multiple subjects, and you will be able to use the concepts that you have learned from that book. Using a guidebook is also great for this because there are topics covered, that you have learned in previous classes, and they are discussed, explained, and shown, using the guidebook itself.
Sometimes you will see a lot of questions on an organic chemistry practice exam, which is why it is important to learn the right way to study. There are ways to use study software to study, but there are many times when you can just flip through a book.
When you get to the real exam, you will be surprised at how quickly you can get through it. As long as you understand the structure of the test, and you can answer all the questions correctly, you will pass it in no time.
If you have some sort of preparation for the real exam, such as the books and the guidebook, you will do better on the real exam. If you have not had anything to prepare with, then you will do worse on the real exam.
If you use the material from the books and the guidebook, you will find that you do quite well on your organic chemistry practice exam. As long as you study all of the materials, and you know the material well, you will do great on the real exam.