Hello!!

NCERT will be providing solutions for the question in NCERT text books which are standard textbooks.

Go through below links for more details.

https://www.careers360.com/question-which-subject-books-of-ncert-class-6th-to-10-th-are-required-for-upsc-exam-please-the-name-of-the-books

https://www.careers360.com/question-which-of-the-ncert-bookssubject-of-6th-to-10th-class-is-required-for-the-preparation-of-upsc-exam-after-passing-class-12th

All the Best.

Hey Noah

You may look for Arihant Experts NCERT solutions mathematics for class 6. You'll find the book on your near by book store or you may order it online.

Hope you find this helpful.