i think u have the wrong pre-req up .. this is 2oa3:
CHEM 2OA3 ORGANIC CHEMISTRY I An introduction to organic chemistry with emphasis on the reactions of functional groups and an introduction to spectroscopic techniques for structure determination.
Three lectures, one lab (three hours) every other week; one tutorial (two hours) every other week; one term
Prerequisite(s):
CHEM 1AA3 and registration in an Honours Program. Students with a grade of less than C- in
CHEM 1AA3 are encouraged to seek counselling before attempting this course. Prerequisite (Beginning 2010-2011):
ISCI 1A24; or
CHEM 1AA3 with a grade of at least C- and registration in an Honours program; or
CHEM 1AA3, registration in an Honours program and permission of the Department. (See Department Note 2.)
but yes.. i think the reason it wont allow u is because u have not yet completed 1aa3... go see an academic advisor to see if u can get a waiver based on your current marks.. or wait until the course is over
edit: didnt see post above b4 posting