The Add deadline, the last day to sign up for a class in SIS, is February 2nd. I would advise you against adding a class two-weeks into the semester unless you've been attending that class regularly, or have made some other arrangement with the professor. February 3rd is the last day that you can drop non-engineering classes, like Chemistry, Physics, or humanities courses. The Drop deadline for engineering courses isn't until March 2nd. I suggest that you put these deadlines in your calendars and be very careful not to miss them! There's no such thing as a ‘late drop.