put mind to
put (one's) mind to (something)
To give something one's complete attention, determination, and effort. You can still manage a B average if you put your mind to acing the final exam. I know we can win this game, but we all have to put our minds to it.
put one's mind to somethingand set one's mind to something
Fig. to concentrate on doing something; to give the doing of something one's full attention. I know I can do it if I put my mind to it. I will set my mind to it and finish by noon.