Plan your day to some extent, if not an actual schedule.
If you have small children adjust to fit their needs. Play outside in the cool of the early morning, run errands 10-ish, come home for lunch. Naps while it's hot.
Group your errands so your route is most efficient & if you're going to grocery shop, do that last. Write things down so you don't keep forgetting to get a new key made or go to the hardware store for the odd-sized light bulb they don't sell at the grocery store. Do what you can online: pay bills, buy stamps. Print out your own postage & have packages picked up at your door if you've got little ones.
If you watch tv in the evenings multitask. Get a calendar & figure out if there are birthdays or other occasions coming up in the near future & make a note so they don't get forgotten. Or match a load of socks or shred paperwork you don't want to put directly into the trash while you're sitting there.
Check your locale for links & websites of fun, educational & free events & places to go. Do that towards the end of one month for the upcoming one so you'll have some ideas of things to do. Your local library is a great resource for this.
Some mamas are brave enough to streamline clothes. They buy all red shirts & khaki shorts or navy & white or other combination & never worry about matching or finding all the parts to an outfit.
Give homemade gifts to teachers & neighbors, a plate of cookies or box of snack mix is always welcome & doesn't represent anything that requires further care--no need to find a place to keep it, dust it, work it into your wardrobe. You eat the gift, enjoy & that's it.