A lot of the schools will look at your last 60 credit hours to calculate your GPA. I ended up having to take three summer courses and postponing my graduation date to get rid of classes from 14 years ago that pulled my GPA down using this criteria. I am reapplying this year to grad school, but I'm still seeing my GPA being calculated will all college credits (from 16 years ago to now). I ended up touching bases with admissions at the programs I applied with and double checked on their policy when calculating GPA, especially from CSDCAS. Hope that helps