Advice about courses

<p>Hey Guys,
I am a biochem/chem major at UCSD revelle college. I am scheduling courses for spring quarter.
I am going to take chem 100A, chem 140C, physics 2D. I am keeping my options open for summer classes.
I was thinking should I take chem 143A instead of chem 100A? which one of the two courses would be easier in the summer? Also, I still have to finish the hum 3,4,5 requirement of revelle. Is it easier to take hum over the summer?
I would really appreciate your advice regarding it.
Any ideas?</p>