98% of the questions come from NCERT Syllabus itself. For the remaining questions, we can recommend few books for you:

1. Deepthi Series for Maathematics
2. IPE Textbook for Physics
3. IPE Textbook for Chemistry
4. Chapterwise 25 years Solutions and 5 Mock Tests by Arihant Publications.

You can also prepare with the help of some tips written in our article: https://learn.careers360.com/engineering/ts-eamcet/ and practise sample papers from: https://engineering.careers360.com/articles/ts-eamcet-sample-papers