BGS are the the best by far IMHO when you go distance learning.
The previous poster was right a few hours a day and complete in six months is gonna be very hard work , if you think full time ground school is 6 months and they are in the classroom 8 hrs a day.
You are going to have to plump for the brush ups whther you want to or not they are a required aspect of the course .If you say you always study better alone think of it as learning to work and study with others , an ethos that will be a permanent part of any career you may have in the industry