Safe driving means you must learn the meaning of traffic signs, signal lights, lane-use control signals, and pavement markings. There are several articles on driversprep.com that can help you learn more.
You should also expect questions about right-of-way and when you are expected to yield to pedestrians and other vehicles. Remember that blind pedestrians often have an absolute "right-of-way".
Study all chapters in the Maryland driver's manual carefully. Questions on your real Maryland MVA test are drawn from all parts of your this study guide.
Aim for at least 92 percent on these practice tests. If you get a question wrong, read up and make sure you understand why.