"Treat it like a job" ...I wouldn't do that.
A world class concert pianist or Olympic athlete doesn't get that way through casual or
almost-good effort. If you want the high grades, you must put in the effort necessary to get them.
Treat it like it's the most important thing you do.
Success depends on many things:
- learning how to learn
- learning how to take notes effectively
- discerning and adapting to the professor's personality & style
- effective time management
- focus, eliminating distractions, discipline and work ethic
- innate intelligence or recognition of the lack thereof
My high school preparation was really poor due to circumstances at my rural school system: I got perfect grades in math, but couldn't do anything when I went to college. I took remedial classes to just get to parity. I struggled in engineering classes until I figured out "the system" that worked for me:
[*]I realized I had to work harder, and put forth more effort, to get ahead. That usually translated into 12-18 hour days, 7 days a week. I never missed a homework assignment, and made sure I had done everyone of them correctly. Sometimes I did extra for the practice.
Finished undergraduate with mediocre grades, but tested well on the GRE. THAT got me into a highly regarded Engineering grad school. Continued to struggle with the math. The only way I overcame that was complete focus. I told my sometimes-girlfriend-now-wife "school comes first." There was one semester that was mostly 20-hour days, 7-days a week. But I made a perfect 4.0 score that semester (but, admittedly, finished completely toasted). And graduated with not perfect but very high grades.
That level of effort and concentration is organically life-changing. It opened and expanded my mind in ways I never imagined before or thought possible.