Best book for all Stream is Text book.
If you want to Score more than 90%+ do two things
- Do Textbook Thoroughly
- Solve Last 10 year paper (for all subjects)
I also have a suggestion of an application Oyeexams Available at Google Play Store which can help you to make TamilNadu Board exam easy.
They provide: For 10th, 12th(Science, Commerce and Humanities)
1. Previous 12 years solved papers with all paper sets for TamilNadu.
2. All papers in offline download. NO Internet required every time.