Questions are welcomed in and out of class. Drop in during office hours or make an appointment. Do not wait until exam day to seek extra help. Read assignments before class. If you do not know anyone in class, make it a point to introduce yourself in order to know a few of your fellow students.
Students interacting with each other is an important factor in the learning process.
Also, if you need class notes or want to know if you missed something from a previous class, you'll have someone you know to ask. The website notes will not contain all the material covered in class. Some sample questions from last year's hourly exams will also be posted with the lecture outlines.