No, there is no 'exact scheme'.. and for a very good reason.
It's called "sand-bagging". Some of the less reputable players, if they knew exactly what it took to get to the next level, would get as close as they could without going over, in order to play and beat players of the lower level.
Just play the best you can and when your game says you're ready to move up, you will.
Have a nice day.