I began kusoma the game of Thrones vitabu many years ago. I recently re-read the first 5 and can't wait for season 3 of Game of thrones to start!
So far the Game of Thrones TV series has followed the vitabu pretty closely. There have been some differences but they have been minor and have not affected the ujumla, jumla storyline so far.
However, I feel the epic tale is really only beginning and season 3 will make au break Game of Thrones. I think this because if the onyesha continues to follow the vitabu there will be a lot zaidi bloodshed in the 3rd season.
Please read my link
to see what's coming inayofuata for the cast and characters of Game of Thrones.