I'm depressed, poor college grades, how do i rebuild?

If you think you are depressed then you should see your GP. You might benefit from medication and/or talking therapy. You should also speak to your personal tutor at college for support. Many colleges have student services who can help support you. I'm at uni myself, I was diagnosed with depression & uni organised a fantastic counsellor. I was also given an extension on some work I had to do as I was finding it difficult to concentrate. Speak to college NOW, do not wait until you're depression is sorted, that might take a while. They can't help you if they don't know what the problem is.