Study Helper by Tamseng is available for free on the Google Play store.
The app is designed to block the many tempting distractions your smartphone offers, while you are studying. There is a basis for wanting to do this; a study by Canon last year showed 93% of Australians studying for exams were distracted by digital temptations.
Knowing that is half the battle; here's where Study Helper comes in. This app will block push notifications, and will also block the use of apps you have not explicitly set as needed for your study. It will block all other smartphone features too.
During your set study time it will record the time you have spent, by subject, allowing you to review and evaluate your progress later. You can view your study records and trends across days, weeks and months.
It need not even be for study; business people as well as students need to focus on their work and may similarly find this helpful. Tamseng states the product has helped more than 900,000 students in South Korea and that it will dramatically increase your study efficiency.