alternate picking guitar technique chris brooks

dazzer22

i picked up a book last week  called alternate picking guitar technique chris brooks ,  i don't know if anyone has used this book but  i am up to page 16 trying the examples , I am not a stranger to alternate picking but i have never gone it to great detail with it , I think the hardest part for me  is building up speed but regarding progression of the book  when should i start  page 21  Etudes example 2p with backing track