<p>A little correction to unalove, although she’s generally accurate. My kid took AP Calc BC in high school, but struggled with the second half of it, and pretty much blew the AP test. He placed into the 160 sequence, although he elected to take 150 instead. He found 151 quite easy. Even so, he felt he learned a lot. However, by the end of the year in 153, he was scuffling again.</p>