This should give you a pretty good training in scales :) Do them in order and take your time. This is a lot of info and you need to really understand each of them before moving on.

Intervales
http://www.guitartricks.com/tutorial.php?input=362

C Major Scale
http://www.guitartricks.com/tutorial.php?input=363

C Major Scale Exercises
http://www.guitartricks.com/tutorial.php?input=373

Addtionnal C Major exercises using hammer-ons and pull-offs
http://www.guitartricks.com/tutorial.php?input=338
http://www.guitartricks.com/tutorial.php?input=367

Pentatonic Scales
http://www.guitartricks.com/tutorial.php?input=296
http://www.guitartricks.com/tutorial.php?input=185

Modes Lesson
http://www.guitartricks.com/tutorial.php?input=370

Mixing Major notes in Minor Pentatonic Scale
http://www.guitartricks.com/tutorial.php?input=217
http://www.guitartricks.com/tutorial.php?input=232
http://www.guitartricks.com/tutorial.php?input=244

Scale exercises
http://www.guitartricks.com/tutorial.php?input=28
http://www.guitartricks.com/tutorial.php?input=38
http://www.guitartricks.com/tutorial.php?input=75