Hi Jan,
As a full-time stay-at-home dad & part-time business consultant, I can understand your feelings of frustration. It's really hard to feel productive while you're watching Sponge Bob!!!
But I'd like to throw something else out as well. You said that you're struggling with the "Do It Now" concept of PD. Well, I can understand that but when I look at what you've said, you are doing it now. You are working on the final 2 tests in 6 months. That's now.
I'd also like to recommend
FlyLady.net: Your personal online coach to help you gain control of your house and home. She teaches you how to keep your house picked up & clean doing it 15 minutes at a time and not letting things pile up. She's really helped me a lot in getting the house organized and straightened up. For example, she talks about doing 1 load of laundry every day. You could put it in washer in the morning before you leave for work, change it to the dryer when you get home, and fold it after dinner. That way, you don't have the big pile-up on Saturdays.
Also, if your kids are old enough to be in school, they're old enough to learn some good cleaning habits and some good boundaries. My daughter (7) cleans her own toilet & sink every morning. It generally takes about 3 minutes. I've also had to teach her that when my den's door is closed, she must knock before coming in. You could also set aside some "down" time where the kids need to play in their own room and can't come out until a buzzer rings. Set the alarm for 30 minutes and then you can have some PD time and they can learn to play by themselves. You might have to start out at 10 minutes and work-up, but this would probably work as well.
Anyhow, it's time for me to go and do some of the things on my Action list today.
Have a good afternoon All!
Ed