How can i motivate my fiance to be more successful with his grades and take it more seriously?

How can i postively motivate my fiance to become more successful in college like i know he is capable? How can i help him to not short change himself? His grades depend on his future success as an army officer.How can i motivate my fiance to be more successful with his grades and take it more seriously?
Hold out on him when he does not apply and reward him when he does...men are easily trained...we are like a good puppy dog when it comes to a woman we love ..you hold the power of our favorite pleasure..use it against us (but in a fun and playful way) and you can own the world honHow can i motivate my fiance to be more successful with his grades and take it more seriously?
Just tell him if he doesn't straighten up you are gone.

If he still doesn't do it.

Let him go. He is not ready, and you are worth more than he is anyway.

You can do better for sure.

Good luck.