✓ Browse all the tutorials you need in your gadget ✓ After downloading the tutorial, it will be available for reading without internet access ✓ Downloaded tutorials are displayed on a separate bookmark by grade ✓ Ability to delete the downloaded tutorial from the phone memory ✓ Convenient application interface Legality of materials: The textbooks available in the appendix are publicly available on the official website of the Ministry of Education and Science of Ukraine https://mon.gov.ua and o