I read an article today in the Wall Street Journal about nagging your husband being hazardous to your marriage. Indeed true. But I contend nagging your teen is just as hazardous. It's the you ask, they ignore, you ask again, they mumble a response, you bring it up again they roll the eyes. If you're in the middle of this verbal volleyball match get out. It just becomes a mother nagging their child, not an adult female requesting and expecting their teen to be a responsible human being.
Here's what you do instead. Set expectations, make requests, establish consequences then just stay on course. If they do it immediately take a few minutes for a personal celebratory dance in your bedroom. If it takes the reminder system you have set up but still gets done, then you had a good day. If they fail miserably and beligerently disregard your requests then enact the already established consequences.
Bend if you need to, sometimes you will, remember these are the teen years. They require a good amount of flexibility. But what you shouldn't do is keep repeating yourself. It's tiresome for both you and your teen. Then in the midst of it all love and listen, that will be the most effective communication a mother can have with their child at any age.