Pay attention to the style of clothes that she wears, and wear the same style

Not only will you look and smell more attractive, taking care of your grooming shows her that you're mature and capable of important daily tasks. Also pay attention to the style of clothes that she wears, and wear the same style of clothing, this will help her to relate with you and find you overall more attractive. And pay particular attention to these areas:

Shower at least once a day. It's probably best to do this in the morning, so you can start the day feeling fresh and clean. Wash your hair, soap up all over, and rinse off. Use a nice smelling shower scrubs as well, something not too feminine, but not too masculine either, maybe try a smell like mint, or lemon.

Keep your mouth clean. Brush twice daily, floss, and use mouthwash. For help in the middle of the day, use breath mints and chewing gum.

Manage facial hair. Shave daily. Or, if you're growing facial hair, make sure it's trimmed to a uniform length and not scraggly or unruly. If you tend to have a unibrow, consider plucking any stray hairs over your nose.

Wear a combination deodorant-antiperspirant. Apply it as soon as you get out of the shower in the morning. Make sure it also doesn't smell too feminine or too masculine either. Go easy on the cologne. You can use a few sprays of cologne or body spray, but don't go over 3.

Wear clean clothes. If you find yourself scrambling for fresh laundry, consider setting up a regular washing schedule, like doing all your laundry every Sunday night.