Students in the regular or ACS degree tracks will ideally complete their calculus (through 227) and physics (105/106) by the end of their sophomore year, so that they are prepared to take physical chemistry in their junior year. Students should begin taking Math 125 as soon as they are eligible, ideally in their first semester. Physics 105 has a prerequisite of Math 125. Students must complete Math 126 and Physics 106 prior to beginning the physical chemistry sequence. Students in the pre-health track should take Math 125 as soon as possible.