Op9 "Variations over a theme from the Magic Flute" by Fernando Sor. This variation is really hard, with this you can improve your slur technique and your damping technique.

The tenth Study in D major from Matteo Carcassi's 25 Melodious Studies for Guitar. It is a slur-mania with the pinky and the ring finger! A series of triplets with hammer-on and pull-off will be a great tool for training to control your left hand fingers.