Try playing scales on one string. This helps oodles. Example:
In the key of C you would play on the first string (or smallest string) open, 1st, 3rd, 5th, 7th, 8th, 10th 12th, (E,F,G,A,B,C,D,E) and back down.
Only three hand positions during this scale exercise. Your hand positions would be 1st position, (Open, 1st finger on 1st fret, 3rd finger on third fret) 5th position, (1st finger on 5th, 3rd finger on 7th, 4th finger on 8th) and 9th position, (2nd finger on tenth fret 4th finger on 12th fret.) As you can see, you can cover the entire fret board up to the 12th fret in three positions. Then do the 2nd string moving your hand to just those three positions, 1st, 5th, 9th and only play the notes i the key of C, (open 1,3,5,6,8,10,12). And so on through all the strings. Then change keys and repeat.
Key notes are to keep your tempo and dynamics consistent especially on position changes and avoid slides or 'glissandos.' Each note must sound the same in its tone and duration. First work on precision, then speed.