I have finished level 1 fundamentals. How do I am know when I am ready to go to level 2?  I can play all the chords and understand the lessons from level 1. I am still slow to switch. Can keep up at beat of 60 on the metronome with chord changes for the most part. Should I just go on to level 2 and keep reviewing level 1 materials along the way?

are there any lectures in guitar tricks on how to read music?  They keep showing the notes in the lectures but they have never explained how to read them? 

thanks