<p>Adjusting to life at Harvard will be hard enough. What’s the rush. Take Math 1a, then Math 1b. You can take 21a at beginning of sophomore year, leaving plenty of time for much harder math classes. I am pretty sure you will have to take a placement test during orientation. This should help you sort it out. Remember, the “below average” math student at Harvard was most likely a valedictorian.</p>