If I'm not mistaken, all summer course marks/final averages get added to your following year.
Example: I'm currently doing PHYS1D03 in the summer as I dropped it during the regular year, but it will not affect my first year Engineering average. These marks will, however, be tacked on to my second year overall CA.
Should be the same for you, for both 1B03 and 1BB3.
Hope that helps!
[Edit] Lol, ninjaposted by mOeeOm.