I've been there! I just posted a thread about the ways I've learned to focus better, it seems that they could help you too!

Here are the steps I took:

1. I de-cluttered my at-home work area. This means NO extras on my desk, a clear work environment helps me stay on task.

2. I made a daily habit. This can be anything that works for you, whether it's meditating, working out, reading etc. For me, it was getting focus tips. I found this site PlaceboEffect.com that offered 1 minute videos every day full of tips to focus better. Only 1 video is available per day so it motivated me to keep checking in and starting the day with focus in mind.

3. I wrote down a list of my most common distractions. Then, I got rid of those distractions - I turned my cell off in class, went to the library to study so my roommates didn't distract me, and made daily schedules & to-do lists to keep myself on track.

4. I set small goals for myself now, like studying for an important test every day until the test. I also set bigger goals for the future, like applying to grad schools or jobs after graduation.

These tips have really helped me focus and concentrate - I feel like it's probably improved my memory too, my mind just feels de-cluttered! Hope these tips help you too!