This are my best android app I use to automate my day to day activity as student....
My one and only assistant is Google assistant which you can invoke my hold your home button on ur Droid device
I will recommend this for you guy especially those that have the habit of procrastinating.
The list are not in any particular order
But I have my favorite which are
1.Any.do
2.Gtask
But you can also check those below out
3.asAna
4.Google keep
5.tasks
6.microsft todo
7.......................
N.....................
Great to do list