Thanks for responding. I've heard about 150 as well, but I've been thinking about it, and it seems like the better choice due to the slower curriculum. I feel as though the 150 horror stories and the consensus that 155 is easier comes from the fact that the people who are worse in Math would pick 150 thinking it would be easy, while those who are good at math pick 155, like engineers. This would lead to a severe difference in test scores, emphasized by the standardized test in 150. Those who do bad in 150 would most likely do just as bad or worse in 155. Oh, as to my chem and calc background, I took IB Math SL, which is probably just as hard or worse than AP Calc, and Pre-IB chemistry, which is much more difficult than honors chem from what I've heard but not as quite as hard as AP Chem.