Thanks Brice, this really helped. I don't think, i will need the tab then. I have no Favorites or Account sections. The app only consist of the different chapters. Each chapter with each own exercise and grammar section.

Thanks Andre, you made some valid points. I will remove the sub menu from the drawer menu. What are your thoughts on the Toolbar (action bar) on the Ben page. It has only a back button. Should I also add the menu button next to it?