I am relatively new to playing, and i had this problem. I found an excercise that really helped was as follows:
Play the 1st,3rd,5th and 7th of the major scale, root note G ( 1 note each)
then slide up to A and again play the 1st,3rd,5th and 7th but this time in the minor scale
then up to the B and repeat the sequence in major
the up to C and repeat in minor
start off slow, getting the notes correct and paying particular attention to finger accuracy correct. Stay relaxed (easier said than done when your trying to concentrate!) and the speed will come on both hands. When you get faster you can start playing each note twice, then four times etc
This helped my speed and accuracy alot, hope it can help you!