Class 1-12 Textbooks All Sub is an Android application developed by Online School Bangladesh that offers all primary and secondary school books, college books, HSC all book 2022, NCTB English version text book class 1 to 10, and classssc) all books in Bangladesh. In this ongoing pandemic situation, this app has become the most handy stuff for school and college students. The app provides high-resolution textbooks that look crispy on good smartphone screens, making it much more convenient for students to study from their smartphones.

Educators highly discourage students from depending on guide books or notebooks and math solutions. They encourage students to build their basics by studying the NCTB Bangla textbook - বোর্ড পাঠ্য বই 2022. The app provides all the textbooks available on the NCTB website, making it easier for students to access them all in one place. Earlier, the NCTB textbook class 1 toEnglish version was not much available in apps, but now it is included in this app as well. This app is free and can be downloaded by anyone who wants to study anytime, anywhere.