Question to those who have taken MATH242

Hi CC,
I am a Comp Sci interest and I have noticed that, as an engineer, I must take MATH241, 242, and 243, and so on. So far, I have only taken MATH241 and I did terribly in that (I got a D+)… The main reason why was because I never took the class seriously. So my question to those who have taken MATH242 is: How different is MATH242 from 241? Is 242 heavily based off of the same concepts of 241? The only reason why I took 242 was because I have a professor who has a very high rating on ratemyprofessor. I have emailed the professor himself, and he has recommended me to re-take 242; however, I feel as if he is saying that just I do not fall too far behind others in 242. So for those of you who have taken MATH241 and 242, how was the transition from 241 to 242? Would you recommend me re-enrolling into 241?