My first two years of college I was lazy and I think I have finally started to turn the corner and I'm doing extremely well in my higher courses. I have received 2 C's and 2 C+'s in undergrad so far. C in Stats, and Gen Chem 1 and a C+ in Bio 1. and Anat 2. Should I retake Chem 1, Bio 1 and stats despite the fact that I am a junior in college?