So lets keep it hypothetical here. Lets say a freshmen is taking intro level [email protected] and Junior level Griffths [email protected] at the same time. The student is doing this because in high school he took calc based [email protected] and believes he can relearn any gaps. The student is getting As in his intro level class but getting not so good grades in his junior class. So he decides to withdraw from it. Will that look bad when it comes to apply to graduate school. Also let's say by the time he applied to grad school he retook [email protected] and got a good grade and had a decent GPA overall.