If you have sacks of money lying about the house but no time then you might want to consider doing a concentrated ground school course. Someone I know did it this way because his business takes up a lot of his time. He was taught exactly what he needed for each subject and passed all of them in one concentrated week. Sounds pretty hard but at least he got them out of the way. It did cost £600 or so , though.
That way isn't for everyone but it might be something you want to consider, I just did it spread out over months (years?) and actually had to re-do air law because I spread the other ones out too much. I'm so happy I've got them out of the way.