Well then, it sounds as if the OP needs to send her children to school full-time. According to her past posts, her children prefer "slobbing on the sofa watching comedy or playing on pc games most of the time." They are not motivated to do anything else and the OP is unwilling or unable to motivate them herself. After years of this, they are now functionally illiterate teenagers. What's going to become of them?
Rainbowmum surely with the internet there are online courses that she could take - like Bravewriter programs for example. Perhaps you could barter for a tutor, perhaps within your homeschool group? Are there programs at the library or community centre on creative writing or adult literacy supports?
It sounds like both you and your children need some outside accountablility to provide them with the kind of education that will allow them to become the kinds of adults they want to be. It takes more than believing in oneself to get into college. Children need to have basic literacy and numeracy skills and if their natural curiousity and engagement in the world isn't facilitating that,I would be looking at other ways to ensure they can fully function as adults.