If your ball flight is inconsistent then the first thing you should look at are your hands (grip) to see if they are coming off the club, during your swing.  In my experience, I have found students don’t realize their hands are coming off the club at the top of the back swing.  This comes from trying to swing bigger and /or having the wrong pressure points while holding on to the club.  A trained eye can see this happening and can make you aware of it.  After finding the problem, you need to correct it by gripping the golf club with correct pressure points.  Most golfers hold onto the club using their first finger and thumbs (pinching). This is great for a drummer but not a golfer.  This creates tension and can make you regrip the club. The better grip is held with the last three fingers of each hand and keeping the right hand connected to the left thumb (for right handers).  The best training aid I’ve found to keep your hands on the club is called the the grip wrap (see product on left).  It is an elastic strap that allows your hands to maintain a constant grip pressure while keeping secure control of the club.  It’s useful for the player that regrips the club or their hands come off the club at the top of the swing.  Another way of practicing keeping your hands on the club is putting a coin between your left thumb and your right hand (again for right handers).  See if you can keep the coin from falling out or you will become very poor!  The Grip Wrap might be the best way to save money.