Replacing a grade.

[SydAlready]

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This semester I took my first chemistry class and severely underestimated how much time I would need to dedicate to homework and studying. Since I'm still working full time out of necessity homework for this particular class didn't get as much attention as it should have. I'm thinking I'm not going to get the grade I want out of the class and I don't feel comfortable moving on without fully grasping the material.

My question is have any of you ever had to "replace" a grade by retaking the class. Also will I still have a relatively good chance of being accepted to vet school as long as this doesn't happen repeatedly?