Tips & Examples for Practicing Scales (Page 3-5) from my ebook (see below). I quickly run through some possible ways to practice scales, there are many, many more ways but hopefully this helps.
Major Scales for Classical Guitar (PDF)
For Beginner to Intermediate Classical Guitarists
PDF includes notation, TAB, fingering, diagrams, tips, and more
Open & closed scale patterns as well as open string shifts
Video Lessons for the book and all scales