move on to study 5 ?

Dave I have just finished study 4 improvising. I have sent you my latest version of my song Blues for Casey. In my latest version I have changed 4 of my 5,,,,,,,,,,,,,,,,5-4-1 endings, and I tried to control my volume better. After listening to my song, can I, and should I move on to section 5 ? Just so you know, I cant get most of the 5-4-1 endings !!! I plan on going over all of your examples many times, but right now alot of them are a struggle. I think you told me awhile ago that I could move on, I just wanted to see if you think I can move on, after listening to my song? Thanks alot Dan