TN 7th அறவயல is an educational app developed by TN Text Book Solution. It is designed to provide comprehensive solutions for the Tamil Nadu State Board 7th standard science book back questions. The app covers the science guide for Class 7 Samacheer Kalvi, with a focus on the first, second, and third terms.

The app includes solutions for various chapters, such as "அளவீட்டியல்," "விசையும் இயக்கமும்," "நம்மைச் சுற்றியுள்ள பருப்பொருள்கள்," and many more. It also covers topics like atomic structure, plant reproduction, human health, and natural resources.

With TN 7th அறவயல, students can easily access the book back solutions in Tamil medium, helping them prepare for exams and strengthen their understanding of science concepts. The app is available for free on the Android platform, making it accessible to a wide range of students.