Information on how to apply to either the B.Sc. or the B.A.&Sc. as a second bachelor degree after the completion of a first bachelor degree can be found on the Admission website.
For information on taking a B.Sc. or B.A.&Sc. as a second degree concurrently with a first degree, please contact pete [dot] barry [at] mcgill [dot] ca (Pete Barry), Chief Academic Advisor in Science.