Practice all scales ascending and descending. Try to play the exercises at various positions on the neck. Start slowly and then gradually increase your speed. Keep your tempo steady by using a metronome.  

{Exercise 1.}
|-----------------|-----------------|---------1-2-3-4-|
|-----------------|-----------------|-1-2-3-4---------|
|-----------------|---------1-2-3-4-|-----------------|
|-----------------|-1-2-3-4---------|-----------------|
|---------1-2-3-4-|-----------------|-----------------|
|-1-2-3-4---------|-----------------|-----------------|

{Exercise 2.}	
|-----------------|-----------------|-----------------|
|-----------------|-----------------|-----------------|
|-----------------|-----------------|-1-2---------3-4-|
|-----------------|-1-2---------3-4-|-----3-4-1-2-----|
|-1-2---------3-4-|-----3-4-1-2-----|-----------------|
|-----3-4-1-2-----|-----------------|-----------------|


|-----------------|-1-2---------3-4-*|
|-1-2---------3-4-|-----3-4-1-2-----*|
|-----3-4-1-2-----|-----------------*|
|-----------------|-----------------*|
|-----------------|-----------------*|
|-----------------|-----------------*|