Should I drop this cl or not?

Right now at college I am taking 4 cles: Prep Reading which I have a D in, Intro to Business which I am uming I have a C in, Intro to Micro Computers which I have a low C in and am on the brink of getting a D, and Business Math which I have a C in but that's due to the HW Pretty much the one cl that has been causing a ton of stress is Intro to Micro Computers because we r learning Excel rite now and it's harder than ever. I have till tomorrow to decide if there is any cles I want to drop, but if I drop Intro to Micro Computers, I could still attend the cl and do the assignments but not get graded, but my point is is should I drop Intro to Micro Computers or not?