Community College to Columbia School of General Studies?

I am not very knowledgeable about the transfer process between a CC and Columbia’s school of general studies. I received several emails and even a letter in the mail from Columbia’s school of GS about possible admission opportunities. I am going to be graduating with my associates degree soon from CUNY HVCC. I have a 3.89 GPA. (All A’s and only 2 B’s, Unweighted). What is the likelihood of acceptance into Columbia’s GS program? Also, I have the opportunity to retake the courses I received the B’s in and try to turn both of the B’s into A’s, which would then result in me bringing my GPA up to a 4.0.