Personally, I would say to not give up. I am going back to school as a second career and I too have to retake some classes. I believe personally that if you retake the classes and are showing a positive trend that should reflect positively in your favor. I would say to also contact a coordinator at your school to see exactly what grades are looked at, meaning if all the grades are looked at or only the higher grade and if the older grades are going to reflect negatively or positively on your GPA. Don't be discouraged and try not to put a time line on life, something I have learned the hard way. Being mentally prepared is VERY important as well. Good luck with everything!!