Ich bin kein Englisch Profi.
Ich selbst würde den Text so hier schreiben, kann dir aber nichts garantieren.
Hi Thalina,
I want to talk with you about the F in your last exam.
Don't be worry about it. It's not because of your skills. Distractions are the real reason. No worries, you can fix this problem easily.
Here are some advice for being concentrated.
At First, you should put your phone away. You can put it in your closet or ask your patents to keep it.
Next, you could write a plan about the things you have to study. You should search for a quiet place and avoid studying in the living room. You also can ask other students or your teacher if you need any help.
You should remember that studying six hours straight without any breaks will not work well. It's better to study for twenty-five minutes and have a five-minute break after that for stay motivated.
I'm sure you will pass your next exam if you follow these rules.