Pitch - The pitch of a note is how high or low it sounds.
Ascending - Play from a low note to a higher note.
Descending - Play from a higher note to a lower note.
Tempo - The speed at which a music composition is to be played
Play these exercises slow and clean and at a constant tempo. Make sure to use the correct fingers and your main focus should be alternate picking. Your speed will increase with a lot of practice.