just something i want to add to people reading this thread - if you find that you arent amazing at a topic, then doing the ocw course from a less elite university might be better for you, this sounds silly but let me explain
i got bored and wanted to do bio 101 for fun. the first unis course i looked at was MIT and then i think berkeley, in both i had no clue what they were talking about, and it was just at a really high pace and expectation, then i saw one from ohio state and im like "may as well try" ; it was so much better explained, super understandable, and just awesome, and at the end of it, you could do the questions set in the MIT course, it was the same level of stuff but explained for a less elite audience
just a thought for people who have felt that open courseware hasnt worked out