Here are 6 good apps designed to help your production, tracking and progress:
ReadEra - e book reader, good and simple, epub, mobi, pdf…
Habitbull - tracking of habits, simple and understandable, you can see your progress in counted days
Brain focus - Great pomodoro technique. Minimalistic and serve its purpose. It will help you to focus and rest when you are in the middle of studying…
Timetune - make your day a routine. This app will take care of that. It will remind you to stick to the plan and help you to navigate in your day.
Wallet - great for your money tracking. If you established a budget for yourself or you are saving, this will make it much easier and analytical.
Arm workout (abs, legs…) 30 min - great workout app, only bodyweight.
Alright, hope it helps