Hi Francis!
I personally would NOT recommend the Berklee methods as they tend to be quite pricey... and sight reading is something that you can train yourself to improve! What I would suggest is making sure that you understand your music theory back to front, and then practice sight reading pieces that are a grade or 2 below your level.
A lot of music shops sell old exam pieces or books at a discounted level... and these books come with some great pieces for practicing!
Hope this helps
I personally would NOT recommend the Berklee methods as they tend to be quite pricey... and sight reading is something that you can train yourself to improve! What I would suggest is making sure that you understand your music theory back to front, and then practice sight reading pieces that are a grade or 2 below your level.
A lot of music shops sell old exam pieces or books at a discounted level... and these books come with some great pieces for practicing!
Hope this helps