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
Also, set one's mind on. Concentrate on or be determined to achieve, as in She's put her mind to improving her test results, or I've set my mind on finding a job I really like. [First half of 1800s]