The standard requirement in a college class is that you spend two hours outside class working on the material for every hour in class. Since this is a four hour class, you should plan on spending about eight hours per week outside of class interacting with the material and solving problems. Including time in class, this course will take 10-15 hours per week of your time. Few students will be able to succeed in this class without investing that amount of time. There is no substitute for spending time learning the material.
College physics requires the student to learn concepts, think deeply, and solve unknown problems.
It does not just consist of finding and using the correct equation. You will learn the material and develop skills necessary to solve problems by coming to class and by diligently completing the assignments. Finally, physics is an objective science. Problems assigned in physics will usually have objective answers. Consequently, grading standards tend to remain high in physics and other science classes.