Need a pack of apps for a busy office worker

I'm new to android and need a pack of apps for productivity. I already have Trello, Google Calendar, Evernote. I work with Office files and PDFs all the time. Need to work with them as easy as I can on PC. Apps that let me to use Track change, highlight, comment. I also need to sync my files to have access to them everywhere. Also, other apps that help me to easily schedule meetings on calendar and help me stay organized are highly appreciated.