Dear Sir,
I am new on freelancer and I haven't done any job here yet. Despite that, I have about two years of experience in android and java programming and I think it won't take any difficulties to provide you desired app.
I still don't know your precise demands but it looks to me very familiar to an app from my portfolio, called Private Tutor. It works with db, has reminders etc... Feel free to take a look.
Looking forward to hear from you
Dragan Ristic