Practice yomaa

When first learning to switch chords of good practice method is to fret chords and practice lifting your fingers from the fret board a little while keeping them in the form of the same chord. Then place your fingers on the fret board back in the same chord positions. Select all the notes chord individually and then strum the chords to inspect all records of the ring finger is still clean and you have not shifted.
When you are ready to change the finger chords visualize in your mind of the next chord will change. After this time visualization process will be automated and will greatly help you to move fast and clean chords.

When changing the chord you want to check the fingering for each chord to determine whether there are general-fingered notes between each chord. If one or two fingers are still pressed on the same note, then leave them pressed while you move to the next chord while moving your other fingers around them. Don’t take the fingers from the neck if you do not need that - Especially if you will just put them back in the same place with the next chord - Just leave them. It is shared finger. And principles will enhance and accelerate your ability to change chords. Always analyze fingering chord changes in this way. So it does not have any additional finger movement of the fret board. Keep all fingers of your fret hand, close to the fret board, may at any time.