This is the official government textbook. Press Open link, choose Class 10 and then Higher Mathematics on the NCTB website.
About this textbook
"Class 10 Higher Mathematics (Textbook)" is a textbook for Class 10 (Higher Mathematics). Edition: Official NCTB textbook. It is part of Holy Cross Learn, the free online learning platform of Holy Cross Rajshahi. No login is needed and it works on phones.