<p>I took 201 without taking 104, and it was fine. I had taught myself AB calculus in highschool, and had taken some of the BC part, but had only gotten a 4 on the AB test. I had taken physics at princeton already (105-106), which had taught much of 201, and a lot of the BC that I hadn’t learned- like taylor series. A lot of the math past 103-104 isn’t actually all that sequential. You can always start out in 201 and drop down to 104.</p>