Likewise, as CCSLP94 mentioned the system is unforgiving for outliers! I have mostly A+ and a couple A's with the exception of a bad semester in third year with a C and a C+ and my average was brought down significantly leaving me with a 3.7 subGPA. Mind you, I've been told that some schools look at you more holistically and if you did uncharacteristically bad in one or two courses but overall excelled they will take that into consideration.