I strongly second the recommendation by @Knowsstuff. Buy it…now. Read it, all of it before you go back to class. Pay special attention to the sections on calendaring and pseudo-studying.
Sure classes can be hard, especially STEM classes, and yes, there can be grade deflation. Someone is getting the As though. My son just graduated from an engineering program where more than 10% of the final grades given are F. Only 60% are A or B. The average graduating GPA is 2.7. He graduated with a 3.7. I asked him what he felt the difference was. His response “organization and work ethic.” Notice, he didn’t say smarts.
Get organized, study between classes, go to office hours IF you need them, learn to study “on the clock” and you’ll be fine.
Good luck!