I just got a transcript with some of my old grades on it and it has a few more Cs than I would like

My first question is if I duplicate/retake say a CLEP or DSST for a class with a low grade do I have a choice as to which one gets credited/used by the school ? (I havent enrolled but EC is prob gonna be it).
My second question is kinda the same but in regard to excess credits..I have Eng 101-102 and Phil 201 on my transcript and I also just took CLEP Humanities/A&I Lit so I have the Humanities/WER covered..but I would like to drop the 102 and Phil since they are Cs..if I am willing to lose the credits, take something else to make up my elective total can I have them NOT include/use designated classes ? In other words if I have 130 credits and only need 120 can I pick which are used (while meeting the basics of course).
Any other ideas or suggestions are welcome,
Blitz