How to have a mature conversation with my mom about stuff?

So I'm 17 and my mother is very protective, which is reasonable and I'm thankful for that. But she's also what one might call a helicopter parent.
She still checks my online grades and schedule every day and feels the need to tell me about every little thing wrong she sees: Why is there a zero for this? Make sure you're using your study halls. Now would be a good time to get ahead on homework, you have that assignment due tomorrow.


I know I'm not perfect at those things all the time, but I try to ask her to let go a bit and she complains that I'm not good at these things so she still has to. I may not be perfect but I feel I can't get better at those things if she doesn't back off. And it's not like I'm totally responsible either. I feel like I use her nagging as a crutch though. When I go to college I can't rely on the stress of my mom finding things out to be responsible.

I want her to loosen up a bit and I'd like to have a mature conversation with her about it, but I don't know how. We don't ever really talk about things so I'm not sure how to approach it without it sounding like I'm accusing her of being a bad mother. Any advice?
Thanks!

 

Thanks for the advice!