I highly recommend the Stanley Yates series Classical Guitar Technique: From Foundation to Virtuosity, Volumes 1 & 2. I prefer this to the Bible of Classical Guitar.
I also recommend Yates' other books, specifically the Graded Repertoire for Guitar Volumes, and The Contemporary Guitar, an Anthology of New Music.
He has quite a few other books, with varying degrees of difficulty, which are unique in different ways; some in the selections of composers, such as Vivaldi and Matiegka, and some which have uncommon transcriptions of Bach for example.
More specific to your inquiry is Etudes Mechaniques, although I'm not familiar with this book.
Definitely worth a look!
"Pay no attention to what the critics say. A statue has never been erected in honor of a critic." -Jean Sibelius