Hmm, I wouldn't bad mouth the college, maybe say something like you wanted to be sure you reached your full potential and decided to redo them, if you say anything at all. I did an Access course, but I didn't explain in my PS why I dropped out of school and didn't do any qualifications, I just focused on the positives. (I dropped out after being attacked by a dog and having surgery constantly because of it, hence missing a lot of school) If you try to navigate the blame however, they may see that as a not so good thing, this is only my opinion, even though it may be true. Just say you felt like you had more to give, you may benefit from asking others opinions, however; I see no problem with you getting into a RG uni. Good luck.