See as per as I know, TS EAMCET asks standard questions which tests your concepts. Now for that you need to be very efficient about your basics and to build basics you have to follow any books with elaborated point of view as well as you can understand reading those books. Now if you read the Telugu academy board and you feel comfortable with it as well as it has all the details required for the exam then go for it. Now if you want to prefer a generalized book to study then go for NCERTs. NCERTs covers most of the details as required for anu entrance as well as to clear concepts.  Now if you feel uncomfortable or demotivated while reading NCERT then its a seperate case else just give it a try. You can get the books as pdf formats so atfirst try from that if you feel comfortable then try to have a physical version.

For a detailed tips about TS EAMCET from experts visit the link below:

https://engineering.careers360.com/articles/how-crack-ts-eamcet

I hope my answer helps. All the very best for your future endeavors!